What size should be obtained if she wishes the estimate to be within 2.5 percent

Question

What size should be obtained if she wishes the estimate to be within 2.5 percentage points with 94% confidence if a pilot study indicates that the percentage is 356%? no prior estimates are used? 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 he uses a 2006 estimate of 48% obtained from a Harris poll. he does not use any prior estimates? Why are the results from parts (a) and (b) so close? A sociologist wishes to conduct a poll to estimate the percentage of Americans who favor affirmative action programs for women and minorities for admission to

Explanation / Answer

formula for sample size is n = [z/E]^2*p(1-p)

= (1.94/.03)^2*.48*.52
= 2348
Both th results are close because in first he first drew the sample however results are not changed , results dont change with change in method

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