McCann and Holmes (1994) tested the hypothesis that exercise reduces depression.
ID: 2956565 • Letter: M
Question
McCann and Holmes (1994) tested the hypothesis that exercise reduces depression.They randomly assign undergraduate women either to an exercise condition
(attending an aerobics class a couple times a week for ten weeks) or to a
relaxation training condition (the individual relaxed at home by watching a
video tape over the same period of time). Although the results showed that the
exercise group reported less depression at the end of the ten week period than
did the relaxation group, why can’t the researcher conclude that exercise
reduces depression?
Explanation / Answer
the null hypothesis was not rejected because at the confidence level used in the test, the two groups had results within the specified amount of deviations from each other.