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How's the economy? A pollster wants to construct a 95 % confidence interval for the proportion...

How's the economy? A pollster wants to construct a 95 % confidence interval for the proportion of adults who believe that economic conditions are getting better.

(a) A poll taken in July 2010 estimates this proportion to be 0.41 . Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.02 ?

(b) Estimate the sample size needed if no estimate of p is available. Part 1 of 2

(a) A poll taken in July 2010 estimates this proportion to be 0.41 . Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.02 ?

A sample of adults is needed to obtain a 95 % confidence interval with a margin of error of 0.02 . Part 2 of 2

(b) Estimate the sample size needed if no estimate of p is available.
A sample of adults is needed to obtain a 95 % confidence interval with a margin of error of 0.02

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