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a physical therapist wants to determine the difference in the proportion of men and women who...

a physical therapist wants to determine the difference in the proportion of men and women who participate in regualr sustained physical activity. what sample size should be obtained if he wishes the estimate to be within two percentage points witb 90% confindence, assuming that,
a) he uses the estimates of 21.3% male and 18.2% female from previous year
b) he does not use any prior estimates

Math   Statistics-And-Probability   
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