History, maturation, and instrumentation are especially threatening to studies when _____.
A) order effects also exist
B) environmental variables are minimal
C) the series of treatments extends over a long period of time
D) there are big individual differences between participants

Question

Quizplus · Accepted Answer

History, maturation, and instrumentation are especially threatening to studies when the series of treatments extends over a long period of time. This is because such effects may be more likely to occur over a long period of time than over a short period of time. However, order effects, environmental variables, and individual differences can also impact the validity of a study.

History, Maturation, and Instrumentation Are Especially Threatening to Studies When