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Annual profit was measured for a group of electrical equipment companies and a group of food...

Annual profit was measured for a group of electrical equipment companies and a group of food and drug stores. The following data was calculated: Elec companies: x1= 5.6, s1= 1.0, n1= 15 Food & drug stores: x2= 2.5, s2= 0.9, n2= 12 Assume the populations are normal and have equal standard deviations. Find a 99% confidence interval for the difference between the mean profits of the two types of companies Please show work if possible!!!! The answers are (2.07,4.13) sp=.9573 df=25, i just dont know how to get them.

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Annual profit was measured for a group of electrical equipment companies and a group of food and drug stores. The following data was calculated: Elec companies: x1= 5.6, s1= 1.0, n1= 15 Food & drug stores: x2= 2.5, s2= 0.9, n2= 12 Assume the populations are normal and have equal standard deviations. Find a 99% confidence interval for the difference between the mean profits of the two types of companies

Please show work if possible!!!!

The answers are (2.07,4.13) sp=.9573 df=25, i just dont know how to get them.

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