A clinic offers a weight-loss program. The table below gives the amounts of weight loss, in pounds, for a random sample of 20 of its clients at the conclusion of the program. Assume that the data are normally distributed. Complete parts (a) and (b). 30 10 15 6 12 16 20 18 17 11 14 6 14 12 22 22 13 18 13 24 . . . a. Find a 95% confidence interval for the population mean. The 95% confidence interval is from a lower limit of to an upper limit of (Round to two decimal places as needed.)