A random sample of 16 pharmacy customers showed the waiting times below (in minutes).

15, 19, 12, 23, 17, 14, 17, 25, 14, 17, 16, 12, 17, 17, 22, 18

Find a 90 percent confidence interval for mean, assuming that the sample is from a normal population. (Round your standard deviation answer to 4 decimal places an t-value to 3 decimal places. Round your answers to 3 decimal places.)

The 90% confidence interval- to -