Chapter 12, Problem 1C

To determine

Find whether the sample data indicate that the mean account balance has declined from $1,600.

Perform a hypothesis test to see whether the mean number of transactions per customer is more than 10 per month.

Check whether the mean number of transactions per customer is more than 9 per month.

Find whether there is any difference in the mean checking account balances among the four branches. Also find the pair of branches where these differences occur.

Check whether there is a difference in ATM usage among the four branches.

Find whether there is a difference in ATM usage between the customers who have debit cards and who do not have debit cards.

Find whether there is a difference in ATM usage between the customers who pay interest verses those who do not pay.