A researcher wanted to compare the relative effectiveness of two techniques for reducing anxiety: a drug and a relaxation exercise.The researcher gave the experimental group both the drug and the relaxation exercise.The control group was given neither the drug nor the exercise.The difference between the drug and the relaxation exercise cannot be compared in this experiment because the experiment involves a
A)redundant relationship.
B)confounding.
C)causal inference.
D)correlation.

Question

Quizplus · Accepted Answer

The experiment involves a confounding variable because both the drug and the relaxation exercise were given to the same group. Therefore, it is impossible to determine which intervention was responsible for any observed effects on anxiety.

A Researcher Wanted to Compare the Relative Effectiveness of Two