Marcy is concerned that her findings may be due to an extraneous uncontrolled variable and not her treatment. Marcy is most concerned with
A) internal consistency reliability.
B) inter-rater reliability.
C) external validity.
D) internal validity.

Question

Quizplus · Accepted Answer

Marcy's concern about an extraneous variable affecting the results suggests that she is worried about the internal validity of her study. Internal validity refers to the extent to which a study accurately measures the relationship between the independent variable (treatment) and the dependent variable (outcome) without any interference from external factors (extraneous variables).

Marcy Is Concerned That Her Findings May Be Due to an Extraneous