Differential attrition decreases internal validity because
A)the independent variable is not manipulated.
B)demand characteristics are present.
C)the experimental groups may differ in unknown ways.
D)pretest sensitization is more likely.

Question

Quizplus · Accepted Answer

Differential attrition refers to the phenomenon where there is a difference in the rate of dropout between various groups within a study. This can lead to groups differing in ways not accounted for by the researchers, potentially affecting the internal validity of the study by introducing unknown variables that could influence the outcomes.

Differential Attrition Decreases Internal Validity Because