QUESTION 19 construct the indicated confidence interval for the difference between the two oopulation means. Assume that the two samples are independent simple random samples selected from normally...

Extracted text: QUESTION 19 construct the indicated confidence interval for the difference between the two oopulation means. Assume that the two samples are independent simple random samples selected from normally distributed populations. Aiso assume that the population standard deviations are equal (sigma1 sigma2), so that the standard error of the difference between means is obtained by pooling the sample variances. A paint manufacturer wanted to compare the drying times of two different types of paint. Independent simple random samples of 11 cans of type A and 9 cans of type B were selected and applied to similar surfaces. The drying times, in hours, were recorded. The summary statistics are as follows. Type A| x1 = 70.9 hr x2 = 68.4 hr $1 = 3.7 hr s2 = 3.2 hr nį = 11 6 = Zu Construct a 99% confidence interval for mu1 - mu2, the difference between the mean drying time for paint type A and the mean drying time for paint type B. -2.73 hrs < mu1="" mu2=""><7.73 hrs="" -0.64="" hrs="">< mu1="" -="" mu2="">< 5.64="" hours="" 0.1.50="" hrs="">< mu1="" -="" mu2="">< 6.50="" hrs="" u="" -2.01="" hrs="">< mu1="" mu2="">< 7.01="" hrs="" question="" 20="" dent="" find="" d="" to="" the="" nearest="">