To construct a confidence interval for the difference between two population means , - 2, use the formula shown below when both population standard deviations are known, and either both populations are normally distributed or both n, 2 30 and n2 2 30. Also, the samples must be randomly selected and independent. (*1 - * 2 ) - 20 n2 H1 - H2 = (*1 -*2)+zo n2 The descriptive statistics for the annual salaries from a random sample of microbiologists from two regions are shown below. Construct a 95% confidence interval for the difference between the mean annual salaries. x, =$103,510, n, =35, and of = $9040; x2 = $85,640, n2 = 44, and 02 = $9065 Complete the 95% confidence interval for 1 - 2 below. 5