The mean and the standard deviation of the sample of 100 bank customer waiting times in Table 1.8 are (xbar=5.49) and s=2.317. Calculate a t-based 95 percent confidence interval for U, the mean of all possible bank customer waiting times using the new system. Are we 95 percent confident that U is less than six minutes? (Choose the nearest degree of freedom for the given sample size. Round your answers to 3 decimal places.)