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Researchers found that people with depression are four times more likely to have a breathing-related sleep disorder than people who are not depressed. Identify the two events described in the study. Do the results indicate that the events are independent or dependent?

Identify the two events. Choose the correct answer below.

A. Research and breathing-related sleep disorder
B. Having a breathing-related sleep disorder and not having it
C. Depression and breathing-related sleep disorder
D. Research and depression

Are the events independent or dependent?