Assume that you have a sample of n_(1)=7, with the sample mean ar{x} _(1)=48, and a sample standard deviation of S_(1)=6, and you have an independent sample of n_(2)=12 from another population with a sample mean of ar{x} _(2)=38, and the sample standard deviation S_(2)=8. Construct a 99% confidence interval estimate of the population mean difference between mu _(1) and mu _(2). Assume that the two population variances ar equal.
<=mu _(1)-mu _(2)s
(Round to two decimal places as needed.)
equal. Round to two decimal places as needed.