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). 8 11 22 17 6 10 23 15 19 14 20 8 12 8 21 18 9 20 12 22 a. Find a 98% confidence interval for the population mean. The 98% confidence interval is from a lower limit of to an upper limit of