As part of an annual review of its accounts, a discount brokerage selected a random sample of 29 customers and reviewed the value of their accounts. The mean was $31,500, with a sample standard deviation of $8,650. (Use t Distribution Table & z Distribution Table.) What is a 95% confidence interval to estimate the mean account value of the population of customers? (Round your answers to the nearest dollar amount.) 95% confidence interval for the mean account valuation is between and