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

  1. A grocery store is interested in determining whether or not a difference exists between the shelf life of two different brands of doughnuts. A random sample of 100 boxes of 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

mean = 2.1

mean = 2.9

standard deviation = 0.8

standard deviation = 1.7

sample size = 100

sample size = 100

Find a 90% confidence interval for the mean difference between the shelf life of the two brands of doughnuts.

Math   Statistics-And-Probability   
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