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A local bank needs information concerning the checking account balances of its customers. A random sample of 15 accounts was checked. The mean...

A local bank needs information concerning the checking account balances of its customers. A random sample of 15 accounts was checked. The mean balance was $686.75 with a standard deviation of $256.20. Find a 98% confidence interval for the true mean. Assume that the account balances are normally distributed.

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