Possible physical and/or psychological changes that occur in the participants over the period of the study refer to this type of threat to internal validity ______.
A) maturation
B) history
C) testing
D) instrumentation

Question

Quizplus · Accepted Answer

Maturation refers to changes in participants that occur naturally over time, potentially confounding the results of the study. This is in contrast to other threats to internal validity such as history (external events that may impact the results), testing (participants becoming more familiar with the study), and instrumentation (changes in measurement techniques over time).

Possible Physical And/or Psychological Changes That Occur in the Participants