Junior Statistician Qualification Examination case studies
Junior Statistician Qualification Examination · Put your knowledge to work in context.
The Junior Statistician Qualification Examination (JSQE) is a professional credential for early-career statisticians and data analysts who want independent verification of foundational statistical competence. It suits graduates entering applied roles, technicians moving into analysis, and candidates preparing for more advanced certifications. The Junior Statistician Qualification Examination case studies are 5 cases and about 4,786 words.
1Pathology Turnaround Time: Skewed Data, a Normality Assumption, and a Unit Trap
The pathology service of a 700-bed hospital audited turnaround time (TAT, hours from specimen receipt to verified report) for 240 consecutive specimens in March. The analyst reports: mean 7.4 h, SD 9.8 h, median 4.1 h, IQR 2.6–6.0 h.
971 words, about 5 min2Stopping an A/B Test at Day 7: Peeking, Multiplicity, and Practical Significance
A retailer's experimentation team is testing a checkout redesign. The pre-launch plan specified 14 days, 50/50 allocation, and a single analysis at the end.
936 words, about 5 min3Calibration Curve: Extrapolating Beyond the Standards and Trusting R²
A clinical chemistry laboratory validates a glucose assay. Six calibrators at 0, 100, 200, 300, 400 and 500 mg/dL are each measured once in a single run.
926 words, about 5 min4Discharge Protocol: Simpson's Paradox, Standardisation, and Effect Measures
A hospital trust reviews whether a new discharge protocol reduced 30-day readmissions. Over 12 months, 1,000 patients followed the protocol and 116 were readmitted (11.6%); 1,000 patients discharged before rollout formed the comparison group and 214 were readmitted (21.4%).
967 words, about 5 min5Rebasing and Splicing an Output Index: Laspeyres versus Paasche, and a Seasonal "Collapse"
A national statistics office publishes a monthly index of pharmaceutical output, base 2015 = 100, using a Laspeyres formula with weights updated only at rebase. For 2024 the Laspeyres index is 138.2; a Paasche variant computed by a research institute is 127.5.
986 words, about 5 min