Determine the p-value in and interpret its meaning

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Reference no: EM131968204

10.20 Nine experts rated two brands of Colombian coffee in a taste-testing experiment.

A rating on a 7-point scale (1=extremely unpleasing, 7=extremely pleasing) is given for each of four characteristics: taste, aroma, rich-ness, and acidity.

The following data stored in Coffee contain the ratings accumulated over all four characteristics:

a. At the 0.05 level of significance, is there evidence of a difference in the mean ratings between the two brands?

b. What assumption is necessary about the population distribution in order to perform this test?

c. Determine the p-value in (a) and interpret its meaning.

d. Construct and interpret a 95% confidence interval estimate of the difference in the mean ratings between the two brands.

Reference no: EM131968204

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