A regional U.S. commercial bank issues both Visa credit cards and MasterCard credit cards. As a part of its annual review of the profitability of each type of credit card, the bank randomly samples 36 customers to measure the average annual charges per card. It has completed its analysis of the Visa card accounts and is now focused on its MasterCard customers. A random sample of 36 MasterCard accounts shows the following annual spending per account (rounded to the nearest dollar):

a. Based on these randomly sampled accounts, what is the best point estimate of the true mean annual spending for MasterCard account holders?
b. If the bank is interested in developing a 95% confidence interval estimate of mean annual spending, what distribution will be used to determine the critical value?
c. Determine the standard error of the sampling distribution.
d. Construct the 95% confidence interval estimate for the population mean of annual MasterCard spending for the bank€™s customers.
e. If the bank desires to have a higher level of confidence in its interval estimate, what will happen to the margin of error?

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S2.869 S3,770 S2.854 S2.750 S2.574 $2,972 S2.549 S3.267 S3,013 2,707 2.794 S1,189 S2.230 S2.178 S3.032 S3.485 S2.679 $2.010 S1,994 S2,768 S3.853 $2.064 $3,244 S2,738 $2.807 S2.395 S3,405 S3.006 S3.368 $2.691 S1,996 S3,008 S2.730 $2,518 S2.71 S3,719