To construct a confidence interval for the difference between two population means 212 , use the formula shown below when both population standard

To construct a confidence interval for the difference between two population means

​,

use the formula shown below when both population standard deviations are​ known, and either both populations are normally distributed or both

and.

​Also, the samples must be randomly selected and independent.

less than<less than<

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.

equals=​$106 340

equals=40​,

and

equals=​$8590​; =​$85580,

=44​,

and =​$8580

Complete the​ 95% confidence interval for

below.

​$nothing less than<less than<​$nothing

​