When an outside event occurs during a within-subject study and influences some of the treatment conditions but not others,the results are said to be confounded by
A)history effects.
B)instrumentation.
C)maturation.
D)regression toward the mean.

Question

Quizplus · Accepted Answer

History effects refer to events that occur outside of the experiment that may influence the results. If an outside event occurs during a within-subject study and influences some of the treatment conditions but not others, it can create a history effect that confounds the results. Instrumentation refers to changes in the measurement tool or procedure, maturation refers to natural changes that occur over time, and regression toward the mean refers to the tendency for extreme scores to move toward the average over time. None of these fully address the scenario described.

When an Outside Event Occurs During a Within-Subject Study and Influences