Recently a Group of Adults Who Swim Regularly for Exercise

Recently a group of adults who swim regularly for exercise was evaluated for depression. Each person's depression status was recorded as either currently depressed, likely to get depressed, or not depressed. It turned out that these swimmers were less likely to be depressed than the general population. What sample size was used if the margin of error was about 6%?

A) n = 17
B) n = 36
C) n = 278
D) n = 400

Correct Answer:

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