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

15 19 16 18 10 20

22 9 19 22 18 20

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

The 90% confidence interval ____________ to __________