Which of the following will cause a participant's scores to change, even though the participant hasn't actually changed?
A) instrumentation
B) statistical regression
C) both a and b
D) neither a nor b

Question

Quizplus · Accepted Answer

Instrumentation refers to changes in measurement tools or procedures that can affect scores. Statistical regression refers to the tendency of extreme scores to move towards the mean on subsequent testing, affecting scores without actual change in the participant.

Which of the Following Will Cause a Participant's Scores to Change