In a within-subjects study that extends over a relatively long time,it is possible that there will be systematic changes in the participants' skills or knowledge during the time of the study.If these changes influence the participants' scores,causing scores at the end of the study to be different from scores at the beginning,the effect is called
A)a history effect.
B)instrumentation.
C)maturation.
D)regression toward the mean.

Question

Quizplus · Accepted Answer

Maturation refers to changes in participants' skills or knowledge that naturally occur over time, and may influence scores in a within-subjects study that extends over a long time. A history effect refers to external events that may impact the results, instrumentation refers to changes in the measuring instrument, and regression toward the mean refers to the tendency for extreme scores to move closer to the mean over time, but is not specific to within-subjects designs.

In a Within-Subjects Study That Extends Over a Relatively Long