SOLUTION: Please help I When Mr. Selig took over as president of Century several years ago, the use of debit cards was just beginning. The Excel file "banking" at the rEsource site contains

Question 251797: Please help I When Mr. Selig took over as president of Century several years ago, the use of debit cards was just beginning. The Excel file "banking" at the rEsource site contains the data. He would like an update on the use of these cards. Develop a 95 percent confidence interval for the proportion of customers using these cards. On the basis of the confidence interval, is it reasonable to conclude that more than half of the customers use a debit card? Interpret the results.
With many other options available, customers no longer let their money sit in a checking account. For many years the mean checking balance has been $1,600. Does the sample data indicate that the mean account balance has significantly declined from this value? Include confidence interval analysis.
Recent years have also seen an increase in the use of ATM machines. When Mr. Selig took over the bank, the mean number of transactions per month per customer was 8; now he believes it has increased to more than 10. In fact, the advertising agency that prepares TV commercials for Century would like to use this on the new commercial being designed. Is there sufficient evidence to conclude that the mean number of transactions per customer is more than 10 per month? Include confidence interval analysis.
Could the advertising agency confidently say the mean is more than 9 per month? Include confidence interval analysis.
don't understand how to get the answer. Thanks!
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
Apparently the data needed for this problem is in some Excel file named "banking" at some Resource website.

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