Gary conducts a study to examine the effectiveness of an exercise program on weight loss. The experimental group must exercise for two hours per day for six months. The control group must exercise for 15 minutes per day for six months. Gary finds greater weight loss in the experimental group than the control group. Unfortunately, 60% of the participants in the experimental group dropped out of the study, compared to 10% of the control group participants. Gary has encountered what kind of problem?
A) Statistical regression
B) Instrumentation
C) Mortality
D) Maturation

Question

Quizplus · Accepted Answer

The problem Gary encountered is "mortality," which refers to the dropout rate of participants in a study. The high dropout rate in the experimental group can affect the validity of the study's results.

Gary Conducts a Study to Examine the Effectiveness of an Exercise