Another way of looking at the data from Eysenck’s (1974) study is to compare four groups of subjects. One group consisted of Younger subjects who were presented the words to be recalled in a condition that elicited a Low level of processing. A second group involved Younger subjects who were given a task requiring the Highest level of processing (as in Exercise 11.2). The two other groups were Older subjects who were given tasks requiring either Low or High levels of processing. The data follow.

Younger/Low: 8646765797 Younger/High: 21 19 17 15 22 16 22 22 18 21 Older/Low: 9 8 6 8 10 4 6 5 7 7 Older/High: 10 19 14 5 10 11 14 15 11 11

a. Run a one-way analysis of variance on these data.

b. Now run a one-way analysis of variance on treatments 1 and 3 combined (n 5 20)
versus treatments 2 and 4 combined. What question are you answering?

c. Why might your answer to part

(b) be difficult to interpret?