# Confidence Interval Assignment | Professional Writing Services

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

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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.

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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

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