The mean and the standard deviation of the sample of 100 bank customer waiting times are x?? x ¯ = 5.30 and s = 2.011. Calculate a t-based 95 percent confidence interval for µ, the mean of all possible bank customer waiting times using the new system. Are we 95 percent confident that µ is less than 6 minutes?. Assume normality. (Choose the nearest degree of freedom for the given sample size. Round your answers to 3 decimal places.) The t-based 95 percent confidence interval is [ , ]. , interval is than 6.