Researchers interested in determining the relative effectiveness of two different drug treatments on people with a chronic illness established two independent test groups. The first group consisted of 11 people with the illness, and the second group consisted of 16 people with the illness. The first group received treatment 1 and had a mean time until remission of 183 days with a standard deviation of 8 days. The second group received treatment 2 and had a mean time until remission of 174 days with a standard deviation of 7 days. Assume that the populations of times until remission for each of the two treatments are normally distributed with equal variance. Construct a 95% confidence interval for the difference u,-, between the mean number of days before remission after treatment 1 (u,) and the mean number of days before remission after treatment 2 (u,). Then complete the table below. Carry your intermediate computations to at least three decimal 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?