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A television sports commentator wants to estimate the proportion of citizens whofollow professionalfootball. (a) What sample size should be obtained if he wants to be

A television sports commentator wants to estimate the proportion of citizens who"follow professionalfootball."

(a) What sample size should be obtained if he wants to be within 3 percentage points with 96% confidence if he uses an estimate of 48% obtained from apoll? (Round up to the nearestinteger.)

(b) What sample size should be obtained if he wants to be within 3 percentage points with 96% confidence if he does not use any priorestimates? (Round up to the nearestinteger.)

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