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). 13 10 8 14 12 20 22 15 25 24 11 6 12 11 20 18 11 15 11 21 a. Find a 90% confidence interval for the population mean. The 90% confidence interval is from a lower limit of to an upper limit of