Suppose a national survey of college students includes measures of depression and the amount of exercise that a student gets. The survey shows that students who exercise frequently tend to be less depressed than students who seldom exercise.
a. What do these data reveal about the causal relationship between amount of exercise and depression?
b. Can you conclude that lack of exercise is a cause of depression?

Question

Suppose a national survey of college students includes measures of depression and the amount of exercise that a student gets. The survey shows that students who exercise frequently tend to be less depressed than students who seldom exercise.
a. What do these data reveal about the causal relationship between amount of exercise and depression? 
b. Can you conclude that lack of exercise is a cause of depression?

Quizplus · Accepted Answer

The Answer of Suppose a national survey of college students includes measures of depression and the amount of exercise that a student gets. The survey shows that students who exercise frequently tend to be less depressed than students who seldom exercise.
a. What do these data reveal about the causal relationship between amount of exercise and depression? 
b. Can you conclude that lack of exercise is a cause of depression?

Suppose a National Survey of College Students Includes Measures of Depression