Psychology: Testing A psychologist has developed a mental alertness test. She wishes to study the effects

(if any) of type of food consumed on mental alertness.

Twenty-one volunteers were randomly divided into two groups. Both groups were told to eat the amount they usually eat for lunch at noon. At 2:00 p.m., all subjects were given the alertness test. Group A had a low-fat lunch with no red meat, lots of vegetables, carbohydrates, and fiber. Group B had a high-fat lunch with red meat, vegetable oils, and low fiber. The only drink for both groups was water. The test scores follow.

Group A 76 93 52 81 68 79 88 90 67 85 60 Group B 44 57 60 91 62 86 82 65 96 42 68 98 Use a 1% level of significance to test the claim that there is no difference in mental alertness distributions based on type of lunch.

AppendixLO1