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 | x¯B=2.7 |
| sA=0.7 | sB=1 |
| nA=91 | nA=95 |
Find a 97% confidence interval for μA−μB, that is, the difference in mean shelf life between Brand A and Brand B.
Homework Answers
The statistical software output for this problem is:
Hence,
97% confidence interval will be:
(-0.978, -0.422)
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