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

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The following data show the costs charged by a tax preparation service for a random sample of 15 tax returns. These data can also be found in the Excel file titled tax prep costs. xlsx.

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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Business Statistics

ISBN: 9780321925121

2nd Edition

Authors: Robert A. Donnelly

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Question Posted: Jul 17, 2015 07:12 AM

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

Question:

$135 $120 S150 $110 $90 $115 $130 $200 $180 $200 $140 S150 $100 $75 $70

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a b c d The population needs to ...View the full answer

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