Use the guidelines to evaluate the study. From the information given, what is the biggest flaw in the study?
-A medical researcher randomly selects 500 Japanese people and 500 Americans. She questions the 1000 people. She finds that the Americans work longer hours on average and also that the
Americans have a higher rate of heart disease. She concludes that working longer hours is
Associated with a higher incidence of heart disease.
A)Variables are hard to define/measure
B)Selection bias
C)The source
D)Participation bias
E)Confounding variables

Question

Quizplus · Accepted Answer

The biggest flaw in the study is the presence of confounding variables. The study does not account for other factors that could influence the incidence of heart disease, such as diet, genetics, lifestyle, or healthcare access, which might differ significantly between the Japanese and American populations. These uncontrolled variables could confound the relationship between working hours and heart disease.

Use the Guidelines to Evaluate the Study