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The manager of the sportswear store credit department wants to determine if the average monthly balance...

The manager of the sportswear store credit department wants to determine if the average monthly balance of credit card holders is $ 75. An auditor selected from a random sample of 100 accounts and found that the average debt was $ 83.40 with a standard deviation for the sample of $ 23.65. Using a level of a = 0.05, should the auditor conclude that there is evidence of a. Is the average balance greater than $ 75? b. How does your answer to part (a) vary if the standard deviation is $ 37.26? Construct a 99% confidence interval for the population mean. Corroborate your result from this part those obtained in part (a). c. d. (20 points)
Math   Statistics-And-Probability   
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