There Is Interest at the American Savings and Loan as to Whether

There is interest at the American Savings and Loan as to whether there is a difference between average daily balances in checking accounts that are joint accounts (two or more members per account)versus single accounts (one member per account).To test this,a random sample of checking accounts was selected with the following results:
Based upon these data,assuming that the populations are normally distributed with equal variances,the test statistic for testing whether the two populations have equal means is approximately -1.49.