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How s the economy A pollster wants to construct a 99 9 confidence interval for...

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How s the economy A pollster wants to construct a 99 9 confidence interval for the proportion of adults who believe that economic conditions are getting better Part 1 of 2 X a A poll taken in July 2010 estimates this proportion to be 0 28 Using this estimate what sample size is needed so that the confidence interval will have a margin of error of 0 05 A sample of 1224 adults is needed to obtain a 99 9 confidence interval with a margin of error of 0 05 Correct Answer 874 Part 1 2 Part 2 of 2 b Estimate the sample size needed if no estimate of p is available Espa ol E M cl

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