A Researcher Divides Participants into Those Who Suffer from Insomnia

A researcher divides participants into those who suffer from insomnia and those who sleep well. He compares the two groups on the number of hours each spends at leisure activities in an average week. He finds the insomniacs spend significantly fewer hours at such activities than do the participants who sleep well. In this example, the number of hours spent at leisure activities is

A) the independent variable.
B) the dependent variable.
C) confounded with which group the participant is in.
D) the hypothesis.

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