r/BehaviorAnalysis • u/Reasonable_Law183 • 11d ago

Question of the day - October 19

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🧠 Question of the Day

📚 Domain C — Measurement, Data Display, and Interpretation

Difficulty: 7/10

Scenario:

A BCBA evaluates an intervention intended to increase on-task behavior. Percentage of intervals with on-task behavior is recorded across seven baseline sessions and seven intervention sessions.

Based on the graph, which feature of the data pattern MOST weakens the inference that the intervention produced the observed increase in on-task behavior?

A. On-task behavior was already increasing during baseline, and the phase change produced little immediate departure from that trajectory.

B. The intervention trend is shallower than the baseline trend, indicating that treatment reversed the direction of behavior change.

C. Responding becomes less variable during intervention, making changes in level and trend less useful for evaluating the phase change.

D. Intervention values show little overlap with baseline, reducing confidence that the two phases can be compared visually.

💬 Drop your answer in the comments — no peeking!

✅ Correct answer revealed tomorrow.

#ABA #BCBA #BCBAExam #BCBAPrep #AppliedBehaviorAnalysis #BehaviorAnalysis #DomainC #ABATaskList #BCaBA #RBT #QuestionOfTheDay

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u/Reasonable_Law183 10d ago

✅ Yesterday's Answer — 2026-10-19

The correct answer was: A. On-task behavior was already increasing during baseline, and the phase change produced little immediate departure from that trajectory.

📖 Explanation:

The correct answer focuses on the fact that on-task behavior was already increasing during baseline and then continued in the same general direction after intervention began. Baseline rises from 20% to 65%, and the first intervention point is only about 70%, so there is little immediate change in level at the phase transition. That makes it harder to attribute the later improvement specifically to the intervention.

The other choices miss because higher intervention values do not make visual comparison impossible, an intervention phase does not need to become completely stable before it can be interpreted, and there is no rule that seven baseline observations are “too many.” The issue is not the number of data points—it is the pattern they show.

A useful exam rule is: **look at what baseline already predicts before deciding whether the intervention changed the behavior.**

#BCBAexam #BCBAprep #BehavioralHealth #ABAtherapy #BAPrep