I85PREP
⌘ K
C-RHI study materials
C-RHI study resources

C-RHI practice questions

One question at a time. Build your C-RHI understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Data Content, Structure, and Information Governance

Which characteristic is required for health information to be considered valid data quality?

  1. The data accurately reflect the real-world event or patient state they describe Correct answer.
  2. The data were entered by a clinician rather than staff
  3. The data are retained for the maximum legal period
  4. The data are stored in a cloud-based repository

Explanation

Validity in data quality means the data measure or represent what they are intended to describe, without error or distortion. Storage location, who entered the data, and retention duration do not by themselves establish accuracy of content.

Question 2Data Content, Structure, and Information Governance

A hospital defines each data element, its permitted values, and its format in a central repository. What is this artifact called?

  1. A network topology map
  2. A release-of-information log
  3. A data dictionary Correct answer.
  4. A disaster recovery plan

Explanation

A data dictionary documents the metadata for each data element, including definitions, allowed values, data type, and format. It supports consistent capture and interpretation of data across systems.

Question 3Data Content, Structure, and Information Governance

Under a typical health information governance framework, who holds ultimate accountability for the organization's information assets?

  1. The senior executive leadership and governing body Correct answer.
  2. The individual clinicians who document care
  3. The vendor hosting the electronic health record
  4. The patients whose data are stored

Explanation

Information governance assigns ultimate accountability to senior leadership and the governing body, which establish policy and oversight. Operational staff and vendors carry delegated responsibilities but not final accountability.

Question 4Data Content, Structure, and Information Governance

Which term describes data that are collected for a purpose different from the one now being pursued?

  1. Data archiving
  2. Secondary use of data Correct answer.
  3. Data validation
  4. Primary data capture

Explanation

Secondary use refers to reusing data originally collected for another purpose, such as treatment data applied to research or quality reporting. Primary capture is the original collection event.

Question 5Data Content, Structure, and Information Governance

Which identifier is considered a direct identifier of an individual under common de-identification standards?

  1. Five-digit ZIP code
  2. Admission month
  3. Full name Correct answer.
  4. Year of birth

Explanation

Direct identifiers are values that by themselves reveal identity, and a full name is a classic example. Birth year, partial geography, and admission month are treated as quasi-identifiers that may permit re-identification only in combination.

Question 6Data Content, Structure, and Information Governance

What is the primary purpose of a data governance committee in a healthcare organization?

  1. To negotiate insurance contracts with payers
  2. To set policy and standards for the management and use of data across the enterprise Correct answer.
  3. To provide direct patient care during peak demand periods
  4. To install and repair network hardware in clinical units

Explanation

A data governance committee provides enterprise-wide direction by establishing policies, standards, and decision rights for data management and use. It coordinates stewardship rather than performing clinical, technical, or contracting work.

Question 7Data Content, Structure, and Information Governance

Which element is part of the metadata for a laboratory result field in an electronic health record?

  1. The data type and permitted value range for the field Correct answer.
  2. The name of the nurse who worked the previous shift
  3. The physical address of the outpatient clinic
  4. The patient's insurance policy number

Explanation

Metadata describes data about data, such as field definitions, data types, permitted ranges, and format rules. Insurance numbers, staffing assignments, and facility addresses are operational facts rather than descriptive metadata for the field.

Question 8Data Content, Structure, and Information Governance

What does the term data stewardship most closely describe?

  1. Duty to perform clinical documentation for assigned patients
  2. Authority to approve the annual information technology budget
  3. Assigned responsibility for the quality and appropriate use of a defined data domain Correct answer.
  4. Legal ownership of all servers storing patient records

Explanation

Data stewardship is the delegated, role-based responsibility for the quality, definition, and appropriate use of data within a domain. It is distinct from infrastructure ownership, budgeting authority, and clinical documentation duties.

Question 9Data Content, Structure, and Information Governance

A hospital wants to share a limited data set for research. Which element may remain in a limited data set under common standards?

  1. Patient telephone number
  2. Medical record number
  3. Full-face photograph
  4. Dates of service Correct answer.

Explanation

A limited data set may retain certain date elements, such as admission and discharge dates, while excluding the listed direct identifiers. Telephone numbers, medical record numbers, and photographs must be removed.

Question 10Data Content, Structure, and Information Governance

A quality team finds that 12 percent of records list an impossible value for gestational age. Which data quality dimension is most directly violated?

  1. Granularity
  2. Accessibility
  3. Timeliness
  4. Accuracy Correct answer.

Explanation

Accuracy concerns whether values correctly and plausibly represent reality, and impossible values indicate inaccurate capture. Timeliness, accessibility, and granularity address currency, availability, and level of detail rather than correctness.

Question 11Data Content, Structure, and Information Governance

An analyst needs to compare readmission rates across three hospitals that use different patient identifiers. Which governance tool best enables reliable linkage?

  1. An enterprise master patient index with standardized matching rules Correct answer.
  2. A free-text notes field in each record
  3. A quarterly newsletter describing data sources
  4. A separate spreadsheet maintained by each hospital

Explanation

An enterprise master patient index applies standardized matching and reconciliation rules to link records across systems. Spreadsheets, free-text fields, and newsletters do not provide consistent, governed identity resolution.

Question 12Data Content, Structure, and Information Governance

A governance policy requires that only clinicians directly involved in a patient's care may view that patient's record. Which principle does this policy operationalize?

  1. Data maximization
  2. Open data sharing
  3. Minimum necessary access Correct answer.
  4. Retention minimization

Explanation

Minimum necessary access limits use and disclosure of information to the amount needed for the task at hand. It restricts access to those with a care-related need rather than maximizing availability.

Question 13Data Content, Structure, and Information Governance

Which action best demonstrates application of data governance to a newly purchased analytics platform?

  1. Requiring the vendor to document data lineage and conform to enterprise data standards before go-live Correct answer.
  2. Deferring all documentation until after the first year of use
  3. Allowing each department to configure its own definitions independently
  4. Permitting unrestricted export of patient data to personal devices

Explanation

Governance extends to new systems through requirements for lineage documentation and conformance with enterprise standards prior to implementation. Independent configurations and deferred documentation undermine consistency and accountability.

Question 14Data Content, Structure, and Information Governance

A registry stores a patient's smoking status as a coded value from a controlled terminology rather than free text. What is the primary governance benefit?

  1. Reduced storage cost for the record
  2. Elimination of the need for data validation
  3. Faster network transmission of the record
  4. Consistent aggregation and comparison across sources Correct answer.

Explanation

Controlled terminology enforces shared meaning so that values can be aggregated and compared reliably across sources. It does not primarily reduce storage or transmission cost and does not remove the need for validation.

Question 15Data Content, Structure, and Information Governance

An organization discovers that a vendor's application stores dates in a format incompatible with enterprise standards. Which governance response is most appropriate?

  1. Ignore the issue because the vendor is externally managed
  2. Ask clinicians to manually reformat dates in the record
  3. Document the variance, assess downstream impact, and require a remediation plan with a timeline Correct answer.
  4. Immediately terminate the vendor relationship without analysis

Explanation

Governance responds to standards variances through documentation, impact assessment, and a managed remediation plan. Ignoring the issue, abrupt termination without analysis, and manual clinician workarounds are not controlled responses.

Question 16Data Content, Structure, and Information Governance

Which statement best distinguishes data governance from data management?

  1. Governance applies only to research data, while management applies only to clinical data
  2. Governance sets decision rights and policy, while management executes the operational activities Correct answer.
  3. Governance is performed only by information technology staff, while management is performed by clinicians
  4. Governance is a one-time project, while management is an annual audit

Explanation

Governance defines decision rights, policies, and accountability, whereas management carries out the day-to-day operational activities that implement those decisions. The two are complementary and apply across data types.

Question 17Data Content, Structure, and Information Governance

A patient requests an accounting of disclosures. Which governance function is most directly engaged?

  1. Release of information and disclosure tracking Correct answer.
  2. Vendor contract negotiation
  3. Network capacity planning
  4. Clinical protocol development

Explanation

An accounting of disclosures depends on release-of-information processes and accurate disclosure tracking records. Capacity planning, clinical protocols, and contract negotiation do not produce disclosure histories.

Question 18Data Content, Structure, and Information Governance

A data steward notices that two departments define 'active patient' differently, producing conflicting dashboards. What is the most appropriate first governance action?

  1. Allow each department to keep its definition to avoid conflict
  2. Convene stakeholders to agree on a single enterprise definition and publish it in the data dictionary Correct answer.
  3. Average the two dashboard results into one report
  4. Suppress both dashboards until the next fiscal year

Explanation

Conflicting definitions are resolved through governed consensus on a single enterprise definition documented in the data dictionary. Preserving divergent definitions, averaging results, or suppressing reporting does not establish shared meaning.

Question 19Data Content, Structure, and Information Governance

Which practice best supports data integrity when correcting an erroneous entry in the legal health record?

  1. Overwriting the value without any audit trail
  2. Retaining the original entry and adding a dated, attributed correction Correct answer.
  3. Deleting the original entry so only the correct value remains
  4. Creating a duplicate record with the corrected value

Explanation

Integrity requires that corrections preserve the original entry and add an attributed, dated amendment so the record remains trustworthy and auditable. Deletion, silent overwriting, and duplicate records compromise the record's reliability.

Question 20Data Content, Structure, and Information Governance

An analyst must choose between two sources for mortality data: one updated daily with 2 percent error and one updated monthly with 0.5 percent error. The use case requires near-real-time trending. Which reasoning best reflects governance trade-offs?

  1. Combine both sources without documenting the method
  2. Always choose the most current source regardless of accuracy
  3. Select the source based on documented fitness for the trending purpose and disclose the error rate Correct answer.
  4. Always choose the source with the lowest error rate regardless of timing

Explanation

Fitness for purpose is a governance judgment that weighs timeliness against accuracy for the intended use, with transparency about limitations. Choosing solely on error rate, solely on currency, or undocumented blending ignores the trade-off.

Question 21Data Content, Structure, and Information Governance

A health system wants to use de-identified data for algorithm development while retaining the ability to re-identify for safety follow-up. Which approach best balances these goals?

  1. Remove all codes so re-identification becomes impossible
  2. Rely on the development team to remember patient identities
  3. Publish the fully identified data set to the development team
  4. Use a coded data set with a governed re-identification key held under strict access controls Correct answer.

Explanation

A coded data set with a separately governed re-identification key supports analysis while preserving a controlled path to re-identify when safety requires it. Publishing identified data, destroying all linkage, or relying on memory all fail the balance.

Question 22Data Content, Structure, and Information Governance

A governance audit finds that data lineage is undocumented for a key quality measure. What is the most significant risk this creates?

  1. Higher software licensing costs for the analytics tool
  2. Inability to trace and substantiate reported results when questioned Correct answer.
  3. Increased network latency during report generation
  4. Reduced storage capacity in the data warehouse

Explanation

Without lineage, an organization cannot trace a measure back to its sources and transformations, undermining the ability to defend results. Latency, storage, and licensing are technical or financial concerns unrelated to lineage.

Question 23Data Content, Structure, and Information Governance

An organization's data governance council includes clinical, compliance, information technology, and analytics representatives. Which outcome most directly reflects a mature governance structure?

  1. Documented decision rights and an escalation path for cross-domain data disputes Correct answer.
  2. Frequent meetings without recorded decisions
  3. Decisions made solely by the information technology representative
  4. Deferral of all data disputes to external consultants

Explanation

Maturity is evidenced by defined decision rights and a clear escalation path that resolves cross-domain disputes consistently. Meeting frequency without decisions, single-function control, and external deferral indicate weak governance.

Question 24Data Content, Structure, and Information Governance

A research team requests identified data with a waiver of authorization. Which governance determination is most essential before release?

  1. Assurance that the data will be stored on a personal laptop
  2. Confirmation that an authorized body approved the waiver and that minimum necessary data are provided Correct answer.
  3. Verbal permission from a single clinician
  4. Confirmation that the data will be deleted after one week

Explanation

Release under a waiver requires documented approval by the appropriate authorized body and limitation of the data to what is necessary. Personal storage, informal permission, and short retention do not substitute for that determination.

Question 25Data Content, Structure, and Information Governance

A dashboard reports a measure as 'complete' although 8 percent of source records are missing a required field. Which governance deficiency does this most directly illustrate?

  1. Excessive granularity in the source data
  2. Absence of a completeness threshold and disclosure rule for reported measures Correct answer.
  3. Overuse of controlled terminology
  4. Insufficient network bandwidth

Explanation

Labeling a measure complete despite missing source data reflects the lack of a defined completeness threshold and a rule for disclosing data limitations. Granularity, terminology, and bandwidth do not explain the mislabeling.

Question 26Data Content, Structure, and Information Governance

Which type of data model organizes information around the core entities of a healthcare enterprise and their relationships, independent of any single application?

  1. A backup retention schedule
  2. A physical database schema
  3. An enterprise conceptual data model Correct answer.
  4. A screen layout specification

Explanation

A conceptual enterprise data model describes the organization's major subject areas and the relationships among entities such as patient, encounter, and provider, without tying them to a particular system. It serves as a stable reference that later logical and physical models derive from, which supports cross-system integration and consistent definitions.

Question 27Data Content, Structure, and Information Governance

A health information exchange assigns each patient a single identifier that links records arriving from multiple participating organizations. What is this identifier called?

  1. A national provider identifier
  2. A local medical record number
  3. An enterprise master patient index number Correct answer.
  4. A diagnostic-related group code

Explanation

An enterprise master patient index assigns a persistent cross-organization identifier so that records from different source systems can be linked to the same person. Local medical record numbers remain valid within their own facilities but cannot by themselves resolve duplicates across organizations.

Question 28Data Content, Structure, and Information Governance

Under a typical healthcare records retention program, which action is appropriate when the retention period for a record series has expired and no legal hold applies?

  1. Transfer the records to an unmanaged shared drive for convenience
  2. Keep the records indefinitely in case someone requests them later
  3. Delete the records immediately without recording the action
  4. Dispose of the records according to the approved disposition schedule and document the destruction Correct answer.

Explanation

Retention schedules define both minimum retention and authorized disposition, so records past their period should be destroyed in the manner the schedule specifies, with the destruction documented to demonstrate compliance. Indefinite retention increases risk and cost, while undocumented deletion undermines defensibility.

Question 29Data Content, Structure, and Information Governance

Which characteristic distinguishes structured data from unstructured data in a clinical repository?

  1. Structured data cannot be exchanged between systems
  2. Structured data can only be stored in paper form
  3. Structured data are always less reliable than narrative notes
  4. Structured data conform to a predefined format that supports direct querying and aggregation Correct answer.

Explanation

Structured data are captured in defined fields with specified formats and value sets, which allows them to be queried, aggregated, and compared reliably. Unstructured content such as free-text notes lacks that predefined organization, so extracting meaning from it typically requires additional processing.

Question 30Data Content, Structure, and Information Governance

A governance committee must decide who may approve changes to a standardized data dictionary used across the enterprise. Which arrangement best reflects sound data governance?

  1. Allow the vendor hosting the system to set definitions without organizational review
  2. Let each department edit definitions freely so local needs are always met
  3. Assign defined approval authority and a documented change process with named accountable owners Correct answer.
  4. Defer all definition changes until the next system upgrade

Explanation

Governance requires explicit decision rights, so changes to shared definitions should follow a documented process with assigned accountable owners and review. Uncontrolled local editing or vendor-driven changes without organizational oversight produces inconsistent definitions and unreliable reporting.

Question 31Data Content, Structure, and Information Governance

A payer and a hospital exchange claims and clinical summaries using a standard that defines message segments and trigger events. Which type of standard does this describe?

  1. A privacy consent form
  2. A terminology value set
  3. A messaging interoperability standard Correct answer.
  4. A data retention schedule

Explanation

Messaging standards specify the structure of electronic messages, including segments, fields, and trigger events, so that systems can exchange transactions such as claims and clinical summaries. Terminology value sets supply coded meanings within those messages rather than defining the message structure itself.

Question 32Data Content, Structure, and Information Governance

An analyst maps local laboratory test codes to a national standard terminology so results can be compared across facilities. What is the primary governance benefit of this mapping?

  1. It removes the requirement to retain the original local codes
  2. It enables consistent semantic comparison of results collected under different local coding conventions Correct answer.
  3. It eliminates the need to validate the underlying result values
  4. It guarantees that every facility uses identical workflows

Explanation

Mapping local codes to a shared standard gives the same concept one comparable meaning across sources, which is what allows aggregation and benchmarking. It does not by itself validate values, remove source codes, or standardize operational workflows.

Question 33Data Content, Structure, and Information Governance

A clinical team wants to add a new field to a shared registry. Which step best reflects a governed data content lifecycle?

  1. Add the field directly in production and inform governance afterward
  2. Copy an existing field from an unrelated registry to save time
  3. Create the field only in a local spreadsheet until the next fiscal year
  4. Submit a request that documents purpose, definition, and value set, then obtain review and approval before implementation Correct answer.

Explanation

A governed lifecycle begins with a documented request that defines purpose, meaning, and permitted values, followed by review and approval so the change is consistent with enterprise standards. Implementing first and informing governance later bypasses the controls that prevent duplication and inconsistency.

Question 34Data Content, Structure, and Information Governance

A governance policy states that data collected for treatment may be reused for quality improvement only after review by a designated body. Which concept does this policy primarily operationalize?

  1. Secondary use oversight for data originally collected for another purpose Correct answer.
  2. Primary treatment documentation requirements
  3. Network firewall configuration standards
  4. Physical facility access controls

Explanation

Secondary use refers to repurposing data beyond the original collection purpose, such as using treatment records for quality improvement or research. Requiring review by a designated body operationalizes oversight of that reuse rather than the original documentation or technical safeguards.

Question 35Data Content, Structure, and Information Governance

Two source systems record the same patient's date of birth with different values. Which governance response best addresses the root cause rather than the symptom?

  1. Establish an authoritative source and enforce data entry rules at the point of capture Correct answer.
  2. Report the discrepancy to the vendor and wait for a software fix
  3. Suppress the date of birth in both systems to avoid conflict
  4. Correct the two records manually and take no further action

Explanation

Conflicting values usually arise from unclear source authority and weak entry validation, so designating an authoritative source and enforcing capture rules prevents recurrence. Manual correction alone resolves only the current instance and leaves the underlying cause intact.

Question 36Data Content, Structure, and Information Governance

A privacy officer asks how a data governance program should treat patient-generated health data flowing from a mobile app into the record. Which approach is most consistent with governance principles?

  1. Treat the data as marketing content outside clinical oversight
  2. Apply the same classification, consent, and quality controls used for other clinical data entering the record Correct answer.
  3. Exclude the data from governance because patients created it
  4. Store the data without attribution so its origin is unknown

Explanation

Once patient-generated data enter the clinical record and inform care, they carry the same sensitivity and decision value as other clinical data, so classification, consent handling, and quality controls should apply. Excluding or de-attributing the data weakens both trust in the record and the ability to trace its source.

Question 37Data Content, Structure, and Information Governance

A governance review finds that a report's definition of 'inpatient encounter' has drifted from the enterprise definition after a local modification. Which control would most directly prevent this drift?

  1. Shortening the report distribution list
  2. Version-controlled definitions with periodic reconciliation against the enterprise standard Correct answer.
  3. Annual staff training on report writing techniques
  4. Increasing server capacity for the reporting environment

Explanation

Definition drift is controlled by managing definitions as versioned assets and reconciling local implementations against the approved enterprise standard. Training, capacity, and distribution changes do not detect or correct divergence from the agreed definition.

Question 38Data Content, Structure, and Information Governance

A governance council must set priorities for remediating data quality problems across many domains. Which criterion best aligns remediation effort with organizational risk?

  1. Rank issues by the seniority of the person who reported them
  2. Rank issues by how easy they are to fix regardless of consequence
  3. Rank issues alphabetically by data domain name
  4. Rank issues by their potential impact on patient safety, regulatory exposure, and key decisions Correct answer.

Explanation

Risk-based prioritization directs limited resources toward problems that could harm patients, create compliance exposure, or distort important decisions. Convenience, reporting seniority, or arbitrary ordering can leave high-consequence issues unaddressed.

Question 39Data Content, Structure, and Information Governance

An organization plans to consolidate records from several acquired practices into one warehouse. Which governance artifact is most essential before consolidation begins?

  1. A schedule of office furniture relocations
  2. An agreed enterprise data dictionary with mapped source definitions and identified stewards Correct answer.
  3. A marketing plan for the consolidated service line
  4. A revised employee dress code policy

Explanation

Consolidation succeeds only when each source field is mapped to an agreed enterprise definition and someone is accountable for its meaning, which is what a governed data dictionary with assigned stewards provides. Operational logistics do not resolve the semantic conflicts that consolidation exposes.

Question 40Data Content, Structure, and Information Governance

A governance committee is asked to approve an analytics initiative that would combine clinical and financial data at the patient level. Which consideration is most central to the committee's decision?

  1. Whether the combined use is permitted, appropriately limited, and transparent to affected patients Correct answer.
  2. Whether the resulting report fits on a single dashboard screen
  3. Whether the analytics vendor offers the lowest license price
  4. Whether the project team prefers one visualization tool over another

Explanation

Combining clinical and financial data at the patient level raises questions of permitted purpose, minimum necessary use, and transparency, which are core governance determinations. Cost, tool preference, and presentation format are secondary and do not resolve whether the use itself is acceptable.

Question 41Data Analytics and Informatics

A clinical analyst needs a reproducible, version-controlled pipeline that cleans and transforms patient encounter data before loading it into a warehouse. Which approach best supports reproducibility and auditability?

  1. Emailing raw extracts to analysts who clean them individually
  2. Running transformations manually in a spreadsheet and saving dated copies
  3. Encoding each transformation step as scripted, version-controlled code Correct answer.
  4. Applying transformations ad hoc at query time in the reporting layer

Explanation

Reproducibility requires that each transformation be defined in code stored under version control, so any result can be regenerated and audited. Scripted pipelines also make changes reviewable and reversible. Manual or ad hoc steps leave no reliable record of how data were altered.

Question 42Data Analytics and Informatics

Which data element is best classified as structured data in a healthcare analytics environment?

  1. A coded diagnosis field stored in a fixed-format column Correct answer.
  2. A dictated progress note stored as free text
  3. A scanned discharge summary stored as a PDF image
  4. A photograph of a wound attached to a record

Explanation

Structured data reside in predefined fields with defined formats and types, such as a coded diagnosis column that can be queried and aggregated directly. Free text, scanned images, and photographs are unstructured and require extraction or interpretation before analysis.

Question 43Data Analytics and Informatics

A registry analyst wants to describe the typical length of stay for a cohort. The distribution is strongly right-skewed with several extreme outliers. Which summary statistic best represents the typical value?

  1. The arithmetic mean
  2. The standard deviation
  3. The median Correct answer.
  4. The maximum

Explanation

The median is resistant to extreme values, so it better represents the center of a skewed distribution than the mean, which is pulled toward the tail. Standard deviation measures spread rather than center, and the maximum is a single extreme observation.

Question 44Data Analytics and Informatics

An analyst joins a patient table to an encounter table using patient identifier. Some patients have multiple encounters. What is the expected effect on the number of rows in the result?

  1. Row count expands to one row per matching patient-encounter pair Correct answer.
  2. Row count stays equal to the patient table count
  3. Row count collapses to one row per distinct patient identifier
  4. Row count equals the encounter table count exactly

Explanation

A join on a key where the right side has multiple matches produces one output row for each matching pair, so patients with several encounters appear multiple times. This fan-out is expected behavior of a one-to-many join and must be anticipated before aggregating.

Question 45Data Analytics and Informatics

Which identifier should be used as the primary key of a well-designed patient dimension table?

  1. Patient last name
  2. Attending physician name
  3. A system-assigned surrogate key Correct answer.
  4. Date of birth

Explanation

A surrogate key is a system-generated, stable, and unique value that uniquely identifies each row regardless of changes to descriptive attributes. Names and dates of birth are not guaranteed unique and may change or be shared.

Question 46Data Analytics and Informatics

A dashboard displays the percentage of diabetic patients with a completed annual eye exam. Which element of this metric is the denominator?

  1. The total number of clinic visits
  2. Patients with a completed eye exam
  3. All patients in the eligible diabetic population Correct answer.
  4. The number of eye exams performed by ophthalmology

Explanation

In a proportion, the denominator is the full eligible population against which the numerator is compared. Here the eligible diabetic population defines who could receive the measure, while the numerator counts those with a completed exam.

Question 47Data Analytics and Informatics

Why is de-identification of a dataset important before sharing it with external analytics partners?

  1. It guarantees the data can never be re-identified
  2. It improves the statistical accuracy of the analysis
  3. It reduces the storage cost of the dataset
  4. It removes or masks identifiers to protect patient privacy Correct answer.

Explanation

De-identification removes or masks direct and indirect identifiers so that individuals cannot readily be identified, supporting privacy obligations when data are shared. It does not inherently improve accuracy, reduce storage costs, or provide an absolute guarantee against re-identification.

Question 48Data Analytics and Informatics

A quality team plots monthly hand-hygiene compliance rates on a control chart. A single point falls beyond the upper control limit. What is the most appropriate interpretation?

  1. The control limits should be widened to include the point
  2. A special-cause signal warrants investigation Correct answer.
  3. The process is stable and the point is normal variation
  4. The chart type is invalid for proportion data

Explanation

Control chart limits describe the range of expected common-cause variation. A point outside a limit is a statistical signal of special-cause variation and should prompt investigation of what changed at that time.

Question 49Data Analytics and Informatics

An analyst writes a query to count distinct patients seen each month. The encounter table records one row per encounter and includes a patient identifier and encounter date. Which approach yields the correct monthly distinct patient count?

  1. Count distinct patient identifiers grouped by month of encounter date Correct answer.
  2. Sum the patient identifier values grouped by month
  3. Count distinct encounter identifiers grouped by patient
  4. Count all encounter rows grouped by month

Explanation

Counting distinct patient identifiers within each month ensures a patient with several encounters in the same month is counted once. Counting encounter rows would inflate the figure with repeat visits.

Question 50Data Analytics and Informatics

A model predicting 30-day readmission is trained on data from a single large urban hospital and then deployed at rural hospitals. Performance drops sharply. What is the most likely explanation?

  1. The deployment population differs from the training population Correct answer.
  2. The outcome variable was measured incorrectly at deployment
  3. The model requires a larger number of input features
  4. The model overfits because the training set was too small

Explanation

A model learns patterns specific to its training population, and applying it to a materially different population can degrade performance even if the model was well fit. This is a distribution shift problem rather than a training-size or feature-count problem.