Research Methods

Interactions

HOMEWORK PROBLEM: (12 pts)

Questions:

1. Identify the design (e.g., 3x4 factorial) and total number of conditions. (2 pts)
2. Identify which variables (if any) are manipulated variables, measured variables, (i.e., subject variables) and repeated measures variables. (4 pts)
3. Identify the dependent variable(s). (2 pts)

4. For each IV separately, identify the means of each level of that IV. Do this for all IVs. (2 pts)

5. The interaction is siginficant. Interpret the data. What do the results tell you? (2 pts)

The Research:

The so-called "Mozart Effect" suggests that spatial-temporal abilities improve after listening to music componsed by Mozart. During the study described here, participants agreed to attend two separate testing sessions in the lab. In the first session, participants listened either to music composed by Mozart or to a story that had been recorded on tape. Then they took a test that included 17 questions. The participants then left the lab, returning after two weeks. If they had listened to Mozart during the first session, they listened to the story this time; if they had listened to the story during the first session, they listened to Mozart this time. The researchers recorded whether the participants preferred the story or Mozart. The participants then completed a second test of 17 items.

Table 1. Mean number of problems correctly answered on the 34-item tests. (Note: These results are abbreviated and may not reflect all the variables in the actual study.)

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