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

19 22 18 23 19 15 24 26

27 12 26 16 16 15 26 18

Find a 90 percent confidence interval for, 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 ????