Question

A television sports commentator wants to estimate the proportion of Americans who “follow professional football.”What sample size should be obtained if he wants to be within 3 percentage points with 95% confidence if
(a) He uses a 2010 estimate of 53% obtained from a Harris poll.
(b) He does not use any prior estimates?
(c) Why are the results from parts (a) and (b) so close?


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  • CreatedApril 28, 2015
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