A physical therapist wants to determine the difference in proportion of men and women who participate in
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Question:
A physical therapist wants to determine the difference in proportion of men and women who participate in sustained physical activity. What sample size should be obtained if he wishes the estimate to be within two percentage points with 90% confidence, assuming that
A) he uses the estimates of 21.6% male and 19.8% female from a previous year?
B) he does not use any prior estimates?
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