Cognitive psychologists know that memory for the words in the middle of a list is poorer than memory for the words at the beginning or end of the list. Researchers wanted to see if people with different levels of education remember a different number of items in the middle of a list. They selected two groups of people with n=6 in each group. Group 1 has 12 years of formal education and Group 2 has 20 or more years of formal education. The table below shows the number of words each group remembered from the middle 10 words on the list.                Group 1                     Group 2 4 5 7 7 2 3 4 8 3 6 6 3 a. Is there a significant difference in the number of words remembered from the middle of the list in the two groups? Use an α = .05. b. Compute r2 to measure effect size.

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Cognitive psychologists know that memory for the words in the middle of a list is poorer than memory for the words at the beginning or end of the list. Researchers wanted to see if people with different levels of education remember a different number of items in the middle of a list. They selected two groups of people with n=6 in each group. Group 1 has 12 years of formal education and Group 2 has 20 or more years of formal education. The table below shows the number of words each group remembered from the middle 10 words on the list.

               Group 1                     Group 2

4

5

7

7

2

3

4

8

3

6

6

3

a. Is there a significant difference in the number of words remembered from the middle of the list in the two groups? Use an α = .05.

b. Compute r2 to measure effect size.

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