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The range for a set of data is estimated to be 48 . (a) What is the planning value for the population standard deviation? (b)

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The range for a set of data is estimated to be 48 . (a) What is the planning value for the population standard deviation? (b) At 95% confidence, how large a sample would provide a margin of error of 4 ? (c) At 95\% confidence, how large a sample would provide a margin of error of 3

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