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Need some help with this one. Thanks! Cost of Pizzas A pizza shop owner wishes to nd the 95% condence interval of the true mean

Need some help with this one. Thanks!

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Cost of Pizzas A pizza shop owner wishes to nd the 95% condence 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 $0.17? A previous study showed that the standard deviation of the price was $0.21. Round your nal answer up to the next whole number. X 8 The owner needs at least a sample of D pizzas

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