Researchers interested in determining the relative effectiveness of two different drug treatments on people with a chronic ilness established two independent test groups. The first group consisted of 9 people with the iliness, and the second group consisted of 13 people with the illness. The first group received treatment 1 and had a mean time until remission of 175 days with a standard deviation of 8 days. The second group received treatment 2 and had a mean time until remission of 178 days with a standard deviation of 5 days. Assume that the populations of times until remission for each of the two treatments are normally distribuuted with equal variance. Construct a 95% confidence interval for the difference u"H, between the mean number of days before remission after treatment 1 () and the mean number of days before remission after treatment 2 (). Then complete the table below. Carry your intermediate computations to at least three decamal places. Round your responses to at least two decimal places. (If necessary, consult a list.of formulas.) What is the lower limit of the 95% confidence interval? What is the upper limit of the 95% confidence interval?