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Cost of Pizza. A pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. How

Cost of Pizza. A pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. How large should the sample be if she wishes to be accurate to within $0.16? A previous study showed that the standard deviation of the price was $0.39. Round up to next whole number

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