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

Question

Quizplus · Accepted Answer

A sample size of 278 is typically associated with a margin of error around 6% for proportions in a population, assuming a confidence level of 95%.

Recently a Group of Adults Who Swim Regularly for Exercise