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The following data show the costs charged by a tax preparation service for a random sample of 15 tax returns. a. Using a 98% confidence

The following data show the costs charged by a tax preparation service for a random sample of 15 tax returns.

a. Using a 98% confidence interval, estimate the average cost of the service for preparing a tax return for a customer. b. What is the margin of error for this sample? c. Verify your result using Excel. d. What assumptions are necessary for this analysis?

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