Joseph conducted an experiment and found that participants who were administered a supplement were less likely to contract the flu than those who were not. Irene criticizes the study, citing past experiments that have found null results. She says that the effect Joseph found was likely to be a false positive. Irene is essentially questioning what aspect of Joseph's study?
A) External validity
B) Construct validity
C) Internal validity
D) Face validity

Question

Quizplus · Accepted Answer

Irene is questioning the internal validity of Joseph's study, which refers to the degree to which it can be concluded that the observed effects were caused by the independent variable and not any other factors. She suggests that there may have been confounding variables or flaws in the study design that led to a false positive result. Choices A, B, and D are not relevant to Irene's criticism.

Joseph Conducted an Experiment and Found That Participants Who Were