16. A researcher for a cereal company wanted to demonstrate the health benefits of eating oatmeal. A

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16. A researcher for a cereal company wanted to demonstrate the health benefits of eating oatmeal. A sample of 9 volunteers was obtained and each participant ate a fixed diet without any oatmeal for 30 days. At the end of the 30-day period, cholesterol was measured for each individual. Then the participants began a second 30-day period in which they repeated exactly the same diet except that they added 2 cups of oatmeal each day.

After the second 30-day period, cholesterol levels were measured again and the researcher recorded the difference between the two scores for each participant.

For this sample, cholesterol scores averaged MD 16 points lower with the oatmeal diet with SS 538 for the difference scores.

a. Are the data sufficient to indicate a significant change in cholesterol level? Use a two-tailed test with

.01

b. Compute r 2

, the percentage of variance accounted for by the treatment, to measure the size of the treatment effect.

c. Write a sentence describing the outcome of the hypothesis test and the measure of effect size as it would appear in a research report.

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Essentials Of Statistics For The Behavioral Sciences

ISBN: 9780495812203

7th Edition

Authors: Frederick J. Gravetter, Larry B. Wallnau

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