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Question 1Concepts and Principles of Behavior Analysis

In behavior analysis, which term refers to the environmental event that follows a behavior and alters the future probability of that behavior?

  1. Discriminative stimulus
  2. Consequence Correct answer.
  3. Antecedent
  4. Motivating operation

Explanation

Consequences are stimulus changes that occur after a response and influence whether that response occurs again. Antecedents and discriminative stimuli precede behavior, and motivating operations alter the value of consequences rather than serving as the consequence itself.

Question 2Concepts and Principles of Behavior Analysis

A behavior is defined as any activity of a whole organism that is observable and measurable. Which statement best captures the behavior-analytic view of behavior?

  1. Behavior is anything a person reports thinking or feeling privately
  2. Behavior includes only publicly observable actions performed by groups
  3. Behavior is the interaction of an organism with its environment Correct answer.
  4. Behavior is a stable trait that remains constant across settings

Explanation

Behavior analysis treats behavior as the ongoing interaction between an organism and its environment, which makes it measurable and subject to environmental influence. Private events such as thoughts can be included, but behavior is not limited to public group actions or fixed traits.

Question 3Concepts and Principles of Behavior Analysis

A therapist records the number of hand-raising episodes a student emits during a 30-minute class. Which dimension of behavior is being measured?

  1. Latency
  2. Count Correct answer.
  3. Interresponse time
  4. Duration

Explanation

Count records how many times a response occurs, which is exactly what tallying hand-raising episodes produces. Latency measures time to onset, duration measures how long a response lasts, and interresponse time measures the gap between responses.

Question 4Concepts and Principles of Behavior Analysis

A teacher praises a student each time the student completes a math worksheet, and worksheet completion increases. In operant terms, the praise functions as which of the following?

  1. Negative reinforcer
  2. Punisher
  3. Positive reinforcer Correct answer.
  4. Unconditioned stimulus

Explanation

Adding a stimulus (praise) after a response that increases the future probability of that response is positive reinforcement. Negative reinforcement would involve removing a stimulus, and punishment would decrease the behavior.

Question 5Concepts and Principles of Behavior Analysis

Which schedule of reinforcement delivers reinforcement after a fixed number of responses?

  1. Variable ratio
  2. Variable interval
  3. Fixed ratio Correct answer.
  4. Fixed interval

Explanation

Ratio schedules depend on the number of responses, and a fixed ratio delivers reinforcement after a constant number of responses. Interval schedules depend on time, and variable schedules change the requirement unpredictably.

Question 6Concepts and Principles of Behavior Analysis

Which statement best describes the philosophical position of behavior analysis regarding unobservable mental events?

  1. They are considered irrelevant to any prediction of behavior
  2. They are the primary causes of observable behavior
  3. They are rejected as impossible to study in any form
  4. They are treated as private behavior subject to the same principles Correct answer.

Explanation

Behavior analysis does not deny private events; it treats thoughts and feelings as behavior that follows the same environmental principles. It rejects explaining public behavior by appeal to mental causes while still allowing private events to be analyzed functionally.

Question 7Concepts and Principles of Behavior Analysis

A behavior analyst records whether a client washes hands within 10 seconds of a prompt, noting only yes or no for each opportunity. Which measurement system is being used?

  1. Momentary time sampling
  2. Partial-interval recording
  3. Trial-by-trial recording Correct answer.
  4. Whole-interval recording

Explanation

Trial-by-trial recording scores each discrete opportunity as occurred or not occurred, which matches the yes/no record for each prompt. Interval systems divide observation periods into time blocks, and time sampling checks behavior only at specific moments.

Question 8Concepts and Principles of Behavior Analysis

A child's tantrums are reinforced by attention at home and at school. A plan reduces tantrums at school but they continue at home. This outcome best illustrates which concept?

  1. Stimulus generalization
  2. Setting generalization failure Correct answer.
  3. Response generalization
  4. Behavioral contrast

Explanation

When a behavior change fails to transfer across settings, the result reflects a lack of setting generalization. Stimulus and response generalization concern different antecedent stimuli or different response forms, and behavioral contrast involves opposite changes in two conditions of a single setting.

Question 9Concepts and Principles of Behavior Analysis

A student's disruptive behavior is maintained by escape from difficult tasks. Which intervention is most consistent with the identified function?

  1. Ignore the disruption entirely
  2. Deliver a preferred edible after disruption
  3. Provide a brief break contingent on appropriate requests Correct answer.
  4. Give frequent attention after each disruption

Explanation

If behavior is maintained by escape, teaching and reinforcing an appropriate request for a break addresses the same function with a replacement response. Attention, edible delivery, or ignoring would not match the escape function and could be ineffective.

Question 10Concepts and Principles of Behavior Analysis

Which procedure involves reinforcing successive approximations of a target response until the final form is reached?

  1. Chaining
  2. Fading
  3. Prompting
  4. Shaping Correct answer.

Explanation

Shaping reinforces closer and closer approximations to a terminal response, gradually changing the criterion. Chaining links discrete responses in sequence, while fading and prompting are antecedent manipulations rather than differential reinforcement of approximations.

Question 11Concepts and Principles of Behavior Analysis

A teacher wants a student to complete a long division problem. She demonstrates the first step, guides the student through it, then withdraws help as the student succeeds. Which procedure is she using?

  1. Most-to-least prompting
  2. Time delay
  3. Graduated guidance Correct answer.
  4. Backward chaining

Explanation

Graduated guidance involves providing physical assistance and then systematically reducing it as the learner performs more independently. Most-to-least prompting uses a fixed prompt hierarchy, backward chaining teaches from the last step, and time delay inserts a pause before prompting.

Question 12Concepts and Principles of Behavior Analysis

A behavior occurs at a high rate during the first minutes of a session and then decreases steadily as the session continues without any programmed consequence change. Which schedule effect does this pattern most resemble?

  1. Fixed ratio postreinforcement pause Correct answer.
  2. Fixed interval scallop
  3. Variable ratio break-and-run
  4. Variable interval steady responding

Explanation

A pause after reinforcement followed by a steady run of responses is the classic fixed ratio pattern. Fixed interval scalloping shows acceleration toward the end of the interval, and variable schedules typically produce more consistent responding without a pronounced postreinforcement pause.

Question 13Concepts and Principles of Behavior Analysis

Which of the following best describes the role of a motivating operation?

  1. It weakens behavior by adding an aversive stimulus
  2. It alters the value of a consequence and the momentary frequency of behavior Correct answer.
  3. It evokes behavior by signaling that reinforcement is available
  4. It follows behavior and increases its future probability

Explanation

Motivating operations change the reinforcing or punishing value of a stimulus and, in doing so, alter the momentary frequency of behaviors related to that stimulus. Discriminative stimuli signal availability, and reinforcement and punishment describe consequence effects.

Question 14Concepts and Principles of Behavior Analysis

A researcher wants to compare a treatment to baseline while controlling for the passage of time and repeated measurement. Which single-case design is most appropriate?

  1. Changing criterion design
  2. Reversal design Correct answer.
  3. AB design
  4. Multiple baseline across behaviors

Explanation

A reversal design alternates baseline and treatment conditions, allowing the investigator to demonstrate that behavior changes when the treatment is introduced and withdrawn. An AB design lacks a return to baseline, and multiple baseline and changing criterion designs address different experimental questions.

Question 15Concepts and Principles of Behavior Analysis

A behavior analyst collects baseline data showing an increasing trend before treatment begins. What is the most appropriate interpretation of the baseline?

  1. The data indicate the treatment has already been effective
  2. The trend threatens internal validity and baseline should continue Correct answer.
  3. The baseline is stable and treatment may begin
  4. The behavior is already decreasing and treatment is unnecessary

Explanation

A baseline with a clear trend is not stable, which makes it difficult to attribute later changes to the treatment. Continuing baseline until stability is achieved strengthens the demonstration of experimental control.

Question 16Concepts and Principles of Behavior Analysis

Which statement correctly distinguishes reinforcement from punishment?

  1. Reinforcement is always social and punishment is always automatic
  2. Reinforcement adds stimuli and punishment removes stimuli
  3. Reinforcement decreases behavior and punishment increases behavior
  4. Reinforcement increases behavior and punishment decreases behavior Correct answer.

Explanation

The defining difference is the effect on future behavior: reinforcement increases it and punishment decreases it, regardless of whether stimuli are added or removed. Positive and negative versions of each depend on stimulus presentation or removal, not on social versus automatic delivery.

Question 17Concepts and Principles of Behavior Analysis

A client receives a token after every fifth completed chore, and tokens are later exchanged for preferred items. Which two concepts are illustrated?

  1. Fixed ratio schedule and conditioned reinforcement Correct answer.
  2. Variable interval schedule and unconditioned reinforcement
  3. Variable ratio schedule and extinction
  4. Fixed interval schedule and punishment

Explanation

Reinforcement after a constant number of responses is a fixed ratio schedule, and tokens that acquire value through exchange are conditioned reinforcers. Interval schedules depend on time, and punishment or extinction would reduce rather than maintain the behavior.

Question 18Concepts and Principles of Behavior Analysis

A behavior analyst uses a discriminative stimulus to occasion a response. Which feature defines its effect?

  1. It follows a response and reduces its future probability
  2. It signals the availability of reinforcement for a response Correct answer.
  3. It increases behavior by removing an aversive event
  4. It changes the value of a reinforcer independent of learning

Explanation

A discriminative stimulus is a stimulus in the presence of which a response has been reinforced, so it signals that reinforcement is currently available. It does not itself deliver consequences or alter reinforcer value the way a motivating operation does.

Question 19Concepts and Principles of Behavior Analysis

During extinction, a behavior temporarily increases in frequency, intensity, or variability before decreasing. What is this phenomenon called?

  1. Extinction burst Correct answer.
  2. Resurgence
  3. Adventitious reinforcement
  4. Spontaneous recovery

Explanation

An extinction burst is the temporary increase in responding that often accompanies the onset of extinction. Spontaneous recovery is the reappearance of a response after a delay, and resurgence is the return of previously reinforced behavior when a current contingency weakens.

Question 20Concepts and Principles of Behavior Analysis

A practitioner wants to reduce a behavior by arranging that it no longer produces reinforcement while simultaneously reinforcing a functionally equivalent alternative. Which approach is being described?

  1. Overcorrection
  2. Response cost
  3. Differential reinforcement of incompatible behavior Correct answer.
  4. Noncontingent reinforcement

Explanation

Reinforcing a response that cannot occur at the same time as the target behavior, while withholding reinforcement for the target, is differential reinforcement of incompatible behavior. Noncontingent reinforcement delivers reinforcers independent of behavior, and response cost and overcorrection are punishment procedures.

Question 21Measurement and Data Interpretation

A researcher measures the length of a metal rod five times and obtains 12.4 cm, 12.5 cm, 12.3 cm, 12.4 cm, and 12.4 cm. What is the mean of these measurements?

  1. 12.35 cm
  2. 12.50 cm
  3. 12.45 cm
  4. 12.40 cm Correct answer.

Explanation

The mean is the sum of all values divided by the number of values. The sum here is 62.0 cm, and dividing by five gives 12.40 cm.

Question 22Measurement and Data Interpretation

Which measure of central tendency is most affected by a single extreme outlier in a data set?

  1. The mode
  2. The mean Correct answer.
  3. The median
  4. The range

Explanation

The mean uses every value in its calculation, so one extreme value pulls it strongly toward that value. The median and mode depend on position or frequency and are far more resistant to outliers.

Question 23Measurement and Data Interpretation

A set of data contains the values 3, 5, 7, 7, 9, 11, 13. What is the median of this data set?

  1. 9
  2. 7 Correct answer.
  3. 11
  4. 8

Explanation

With seven ordered values, the median is the fourth value, which sits in the middle. Counting to the fourth position in the ordered list gives 7.

Question 24Measurement and Data Interpretation

A data set has a mean of 50 and a standard deviation of 5. A value of 65 lies how many standard deviations above the mean?

  1. 5
  2. 3 Correct answer.
  3. 4
  4. 2

Explanation

A z-score expresses how far a value lies from the mean in standard deviation units. Subtract the mean from the value (65 minus 50 equals 15) and divide by the standard deviation of 5, giving 3.

Question 25Measurement and Data Interpretation

Which statement correctly describes the difference between accuracy and precision?

  1. Accuracy and precision both describe how close repeated measurements are to each other.
  2. Accuracy concerns repeated values agreeing; precision concerns closeness to the true value.
  3. Accuracy concerns closeness to the true value; precision concerns closeness of repeated values to each other. Correct answer.
  4. Accuracy applies only to instruments; precision applies only to human observers.

Explanation

Accuracy reflects how close a measurement is to the accepted true value. Precision reflects how tightly repeated measurements cluster together, regardless of whether they are near the truth.

Question 26Measurement and Data Interpretation

A balance reads 0.00 g when empty. A sample is placed on it and the display shows 4.52 g. What mass should be recorded for the sample?

  1. 4.5 g
  2. 4.520 g
  3. 4.52 g Correct answer.
  4. 4.6 g

Explanation

The recorded value should keep the same number of decimal places as the instrument displays, which here is two. The reading is 4.52 g, so that is the value to report.

Question 27Measurement and Data Interpretation

A data set of 9 values has a range of 40 and a minimum value of 15. What is the maximum value?

  1. 65
  2. 25
  3. 40
  4. 55 Correct answer.

Explanation

The range equals the maximum minus the minimum. Adding the range to the minimum (15 plus 40) gives a maximum of 55.

Question 28Measurement and Data Interpretation

A calibration curve gives the equation y = 0.25x + 0.10, where y is absorbance and x is concentration in mg/L. A sample has an absorbance of 0.60. What is its concentration?

  1. 2.0 mg/L Correct answer.
  2. 2.4 mg/L
  3. 2.8 mg/L
  4. 1.4 mg/L

Explanation

Substitute the absorbance into the equation and solve for x. Rearranging gives x equal to (0.60 minus 0.10) divided by 0.25, which equals 2.0 mg/L.

Question 29Measurement and Data Interpretation

A set of replicate measurements is reported as 25.0 plus or minus 0.3 mg. What does the 0.3 mg represent?

  1. The systematic error of the method
  2. The uncertainty associated with the measurement Correct answer.
  3. The mean of the measurements
  4. The true value of the quantity

Explanation

The value after the plus-or-minus sign expresses the uncertainty or spread associated with the reported measurement. It indicates the interval within which the true value is likely to lie.

Question 30Measurement and Data Interpretation

A student records the following counts of colonies on four plates: 120, 118, 122, and 120. Which value is the mode?

  1. 120 Correct answer.
  2. 118
  3. 122
  4. 119

Explanation

The mode is the value that appears most frequently in the data set. The value 120 appears twice while all others appear once, so 120 is the mode.

Question 31Measurement and Data Interpretation

A data set has a standard deviation of 2.0 and a mean of 30.0. If every value in the data set is multiplied by 3, what is the new standard deviation?

  1. 9.0
  2. 2.0
  3. 6.0 Correct answer.
  4. 18.0

Explanation

Multiplying every value by a constant multiplies the standard deviation by the absolute value of that constant. The new standard deviation is therefore 2.0 times 3, which equals 6.0.

Question 32Measurement and Data Interpretation

A set of measurements has a mean of 100 and a standard deviation of 10. Assuming a normal distribution, approximately what percentage of values falls between 90 and 110?

  1. 68% Correct answer.
  2. 50%
  3. 99.7%
  4. 95%

Explanation

The interval from 90 to 110 spans one standard deviation on each side of the mean. In a normal distribution, roughly 68% of values lie within one standard deviation of the mean.

Question 33Measurement and Data Interpretation

A titration is performed and the results are 24.10 mL, 24.12 mL, 24.09 mL, and 24.11 mL. The accepted true value is 25.00 mL. What does this data set illustrate?

  1. Both high accuracy and high precision
  2. High precision but low accuracy Correct answer.
  3. Both low accuracy and low precision
  4. High accuracy but low precision

Explanation

The replicate values cluster tightly together, showing high precision. However, all of them lie about 0.9 mL below the true value, so the measurements are not accurate.

Question 34Measurement and Data Interpretation

A researcher collects data on plant height and daily sunlight hours. The correlation coefficient is 0.92. What is the most appropriate interpretation?

  1. Height and sunlight are strongly positively associated. Correct answer.
  2. Sunlight definitely causes the plants to grow taller.
  3. There is no relationship between the two variables.
  4. Height decreases as sunlight increases.

Explanation

A correlation coefficient near positive one indicates a strong positive linear association between the two variables. Correlation alone cannot establish causation, so the result describes association only.

Question 35Measurement and Data Interpretation

A sample has 8 measurements with a sum of 200. A ninth measurement of 40 is added. What is the new mean?

  1. 25.0
  2. 24.0
  3. 26.7 Correct answer.
  4. 30.0

Explanation

The original total is 200 over 8 values. Adding 40 gives a new total of 240 over 9 values, and 240 divided by 9 equals approximately 26.7.

Question 36Measurement and Data Interpretation

A set of data is reported with a relative standard deviation of 2.5% and a mean of 80.0. What is the absolute standard deviation?

  1. 0.5
  2. 2.5
  3. 3.2
  4. 2.0 Correct answer.

Explanation

Relative standard deviation equals the standard deviation divided by the mean, expressed as a percentage. Rearranging gives 0.025 times 80.0, which equals 2.0.

Question 37Measurement and Data Interpretation

Two analysts measure the same sample. Analyst A reports 50.0, 50.1, and 49.9 mg. Analyst B reports 52.0, 49.0, and 51.0 mg. Which statement is correct?

  1. Analyst A is more accurate because the values are smaller.
  2. Analyst B has a smaller spread than Analyst A.
  3. Analyst A is more precise, and both have similar means. Correct answer.
  4. Analyst B is more precise because the values are larger.

Explanation

Analyst A's values cluster within about 0.2 mg of each other, showing much tighter precision. Both sets average near 50 mg, so their means are similar even though the spreads differ greatly.

Question 38Measurement and Data Interpretation

A measurement result is calculated as the product of two quantities: 3.0 and 4.00. How many significant figures should the final answer have?

  1. Two Correct answer.
  2. Four
  3. Five
  4. Three

Explanation

When multiplying, the result carries the same number of significant figures as the factor with the fewest. The factor 3.0 has two significant figures, so the product should be reported to two.

Question 39Measurement and Data Interpretation

A method has a systematic bias of plus 2.0 mg and a random uncertainty of plus or minus 0.5 mg. If the true value is 100.0 mg, within what range will repeated measurements most likely fall?

  1. 100.0 to 102.0 mg
  2. 101.5 to 102.5 mg Correct answer.
  3. 99.5 to 100.5 mg
  4. 97.5 to 102.5 mg

Explanation

The systematic bias shifts the center of the measurements to 102.0 mg. Random uncertainty of plus or minus 0.5 mg then places the expected readings between 101.5 and 102.5 mg.

Question 40Measurement and Data Interpretation

A data set contains the values 4, 8, 6, 10, and 12. A new value of 100 is added. Which statement best describes the effect on the mean and median?

  1. Neither the mean nor the median changes.
  2. The mean increases sharply while the median stays nearly unchanged. Correct answer.
  3. Both the mean and the median increase sharply.
  4. The median increases sharply while the mean stays nearly unchanged.

Explanation

The mean incorporates every value, so an extreme value of 100 pulls it upward strongly. The median depends on the middle position, so adding one high value shifts it only slightly.

Question 41Experimental Design and Behavior-Change Procedures

In behavior-analytic research, what does a functional relation between an independent variable and a dependent variable mean?

  1. The independent variable was measured with a standardized published instrument
  2. The dependent variable stays constant while the independent variable varies
  3. The dependent variable changes reliably when the independent variable is manipulated and not otherwise Correct answer.
  4. The two variables happen to be correlated across a single observation session

Explanation

A functional relation exists when systematic manipulation of the independent variable produces a reliable, replicable change in the dependent variable while other variables are controlled. Correlation alone, measurement formality, or constancy of the dependent variable does not establish this experimental control.

Question 42Experimental Design and Behavior-Change Procedures

A researcher records the dependent variable only during sessions in which the independent variable is absent, then introduces it. Which design element is most directly being used to establish a baseline for comparison?

  1. Baseline condition Correct answer.
  2. Probe session
  3. Generalization phase
  4. A reversal phase

Explanation

A baseline condition measures the dependent variable before the independent variable is introduced, providing the comparison against which treatment effects are judged. Reversal, probes, and generalization phases serve different functions and are not the pre-intervention comparison itself.

Question 43Experimental Design and Behavior-Change Procedures

Which measurement approach best captures the number of responses emitted in a fixed observation period?

  1. Latency
  2. Duration
  3. Interresponse time
  4. Rate Correct answer.

Explanation

Rate expresses response count per unit of time and is the standard measure when the goal is to quantify how many responses occur within a fixed period. Latency, duration, and interresponse time each describe temporal properties rather than counts per unit time.

Question 44Experimental Design and Behavior-Change Procedures

A behavior analyst wants to compare the effects of two treatments on a single behavior that is unlikely to reverse. Which design is most appropriate?

  1. ABAB reversal design
  2. Alternating-treatments design Correct answer.
  3. Changing-criterion design
  4. Multiple baseline across behaviors

Explanation

The alternating-treatments design rapidly compares two or more conditions by presenting them in close succession, so it does not require withdrawal of treatment or behavior reversal. Reversal designs depend on behavior returning to baseline, and the other options address different experimental questions.

Question 45Experimental Design and Behavior-Change Procedures

In a multiple baseline across settings, what pattern of results supports a treatment effect?

  1. Behavior changes in the first setting and then returns to baseline everywhere
  2. Behavior changes only in each setting after treatment is introduced there Correct answer.
  3. Behavior changes in all settings at the same time regardless of when treatment begins
  4. Behavior remains stable in every setting across the whole study

Explanation

A multiple baseline demonstrates control when the dependent variable shifts in each setting only after the independent variable is applied to that setting, while untreated settings remain at baseline. Simultaneous change across all settings suggests a confound rather than a treatment effect.

Question 46Experimental Design and Behavior-Change Procedures

A teacher praises a student each time the student raises a hand, and hand raising increases. Which behavior-change procedure is illustrated?

  1. Negative reinforcement
  2. Negative punishment
  3. Extinction
  4. Positive reinforcement Correct answer.

Explanation

Positive reinforcement occurs when a stimulus is added after a response and the response increases in frequency. Negative reinforcement removes a stimulus, punishment decreases behavior, and extinction withholds the reinforcer that previously maintained responding.

Question 47Experimental Design and Behavior-Change Procedures

Which schedule delivers reinforcement after a fixed number of responses?

  1. Fixed ratio Correct answer.
  2. Fixed interval
  3. Variable ratio
  4. Variable interval

Explanation

A fixed ratio schedule requires a set number of responses before reinforcement is delivered, producing a characteristic high rate with a post-reinforcement pause. Interval schedules depend on elapsed time, and variable schedules change the requirement across deliveries.

Question 48Experimental Design and Behavior-Change Procedures

Which schedule typically produces the highest, most persistent response rate that is highly resistant to extinction?

  1. Fixed ratio
  2. Variable ratio Correct answer.
  3. Variable interval
  4. Fixed interval

Explanation

Variable ratio schedules deliver reinforcement after an unpredictable number of responses, generating high steady rates that persist well during extinction. Fixed schedules produce pauses or scalloping, and variable interval schedules generate moderate steady rates tied to time.

Question 49Experimental Design and Behavior-Change Procedures

A behavior is maintained by attention, and staff now withhold attention following the behavior. Which procedure is being implemented?

  1. Differential reinforcement of other behavior
  2. Time-out
  3. Extinction Correct answer.
  4. Response cost

Explanation

Extinction reduces behavior by withholding the reinforcer that previously maintained it, here attention. Differential reinforcement reinforces an alternative response, response cost removes a stimulus, and time-out removes access to a reinforcing context.

Question 50Experimental Design and Behavior-Change Procedures

Which procedure involves reinforcing a behavior that cannot physically occur at the same time as the target behavior?

  1. Differential reinforcement of other behavior
  2. Noncontingent reinforcement
  3. Differential reinforcement of incompatible behavior Correct answer.
  4. Differential reinforcement of low rates

Explanation

Differential reinforcement of incompatible behavior reinforces a response that is topographically incompatible with the target, making the problem behavior impossible to emit simultaneously. The other options either reinforce lower rates, reinforce any other behavior, or deliver reinforcement independent of behavior.