Which of the following factors affects internal validity by the degree to which criterion instruments may measure different attributes of an individual at two different points in time?
A)Instrumentation
B)Testing
C)Differential investigation
D)Experimental mortality

Question

Quizplus · Accepted Answer

Instrumentation refers to changes in the measuring instrument or criterion used to assess the dependent variable, and can lead to a lack of consistency in the measurement and affect the internal validity of a study. If the criterion instrument used to measure an individual at two different points in time measures different attributes, then the results may not accurately reflect changes in the intended construct. Testing refers to the effect of taking a pretest on the subsequent scores on the posttest, differential investigation refers to differences in the groups being studied, and experimental mortality refers to the loss of participants during the course of the study.

Which of the Following Factors Affects Internal Validity by the Degree