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In an effort to estimate the mean dollars spent per visit by customers of a...

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In an effort to estimate the mean dollars spent per visit by customers of a food store, the manager has selected a random sample of 100 cash register receipts. The mean of these was $45.67 with a sample standard deviation equal to $12.30. Assuming that he wants to develop a 90 percent confidence interval estimate the upper limit of the confidence interval estimate is: a. about $2.02. b. approximately $65.90. c. about $47.69. d. None of the above.

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