A pollster wants to construct a 95% confidence interval for the proportion of adults who plan to take a vacation this year. He estimates from a poll...
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A pollster wants to construct a 95% confidence interval for the proportion of adults who plan to take a vacation

this year. He estimates from a poll last year that this proportion is 0.33. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error .072?

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