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

9. A local bank needs information concerning the savings 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 95% confidence interval for the true mean. Assume that the account balances are normally distributed.

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