As part of an annual review of its accounts, a discount brokerage selects a random sample of 26 customers. Their accounts are reviewed for total account valuation, which showed a mean of $34,500, with a sample standard deviation of $8,150. What is a 90% confidence interval for the mean account valuation of the population of customers? (Round your answers to the nearest dollar amount.) 90% confidence interval for the mean account valuation is between $ 29690 and $ .