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A grocery store manager is interested in determining whether or not a difference exists between the...

A grocery store manager is interested in determining whether or not a difference exists between the shelf life of two different brands of doughnuts. A random sample of boxes for each brand was selected and the shelf life in days was determined for each box. The sample results are given below. Brand A Brand B x¯A=2.1 x¯B=2.7 sA=1.1 sB=1.2 nA=110 nA=108 Find a 91% confidence interval for μA−μB, that is, the difference in mean shelf life between Brand A and Brand B.

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