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 Experimental Design Practice Questions

1 .       By definition, a one-way experimental design must involve [Hint]

 A. a comparison between one treatment group and one control group. B. only one independent variable, with two or more conditions/levels. C. manipulation of two independent variables, where each variable has only one condition. D. one group of participants, who are tested on multiple occasions.

2 .       In a study of taste preference, a researcher has a sample of participants taste Cola A and then rate its pleasantness. They then cleanse their palate by eating some oyster crackers. They then taste Cola B and rate its pleasantness. This research design can best be described as a [Hint]

 A. pretest-postest design. B. randomized groups design. C. matched-subjects design. D. repeated measures design.

3 .       By definition, a factorial design [Hint]

 A. has two or more dependent variables. B. has two or more independent variables. C. has one independent variable, and two or more dependent variables. D. has one independent variables with multiple levels.

4 .       In a 2 x 2 x 3 x 2 factorial design, there are _____________ IVs being manipulated. [Hint]

 A. 2 B. 3 C. 4 D. 9 E. 24

5 .       The mixed factorial design [Hint]

 A. mixes experimental and correlational variables in the same experiment. B. mixes multiple independent variables with multiple dependent variables in the same experiment. C. mixes between-subjects and within-subjects factors in the same experiment. D. compares the results from between-subject experiments and within-subject experiments in a single statistical analysis.

6 .       In research that employs a factorial design, a(n) _____________ is said to exist when the effects of one independent variable and dependent on the condition or level of another independent variable manipulated in that same study. [Hint]

 A. main effect B. complex effect C. higher-order effect D. interaction

7 .       Which of the following graphs depicts an interaction between the two variables being manipulated?

[Hint]

 A. Graph A B. Graph B C. Graph C D. Graph D

8 .       A researcher tests the effects of practice on three math procedures in a sample of 3rd grade students. He randomly assigns participants to complete only one of the three math procedures. The next day, the same participants return and complete the same procedure as they performed the day before. The researcher compares the scores on day 1 to the scores on day 2 for participants completing each procedure, looking for an improvement. What design label is appropriate for the study described above? [Hint]

 A. 2 x 3 repeated measures factorial design B. 2 x 3 randomized groups factorial design C. 2 x 3 mixed factorial design D. 2 x 3 expericorr design

9 .       In the study assessing the effects of practice on math performance (#8), assume the researcher finds that practice significantly improves performance for Math Procedures 1 and 2, but hurts performance on Procedure 3. This finding represents a(n) [Hint]

 A. interaction between practice and math procedure type B. main effect for practice C. main effect for math procedure type D. all of the above

10 .       Dr. Unisex conducts a 2 x 2 randomized groups factorial experiment assessing the effects of leadership style (calm vs. intense) and gender of group leader (male vs. female) on group performance. A(n) _______________ would be present if it were discovered that groups led by a male tended to perform better with an intense leader, while groups led by a female tended to perform better with a calm leader. [Hint]

 A. main effect for gender of leader B. main effect for leadership style C. interaction D. none of the above

11 .       Assume for the study mentioned above (#10), Dr. Unisex finds that groups led by females perform significantly better overall compared to groups led by males, independent of the effects of leadership style. This would demonstrate [Hint]

 A. a main effect for gender B. a main effect for leadership C. an interaction D. None of the above

12 .       A researcher administers a personality inventory and on the basis of participants' responses, uses a median split procedure to assign them to "Low Extrovert" and "High Extrovert" conditions. All participants complete an identical analytical reasoning assessment, but based on random assignment, half of the participants in each group complete the assessment in a sound-room that has windows, while half complete the task in a room with no windows. This study should be classified as a [Hint]

 A. 2 x 2 mixed factorial design B. 2 x 2 randomized groups factorial design C. 2 x 2 repeated measures factorial design D. 2 x 2 expericorr design

13 .       In the study above assessing the effects of personality differences and environment on analytical reasoning (#12), assume High Extrovert participants perform better overall on the reasoning task. We could not assume that being a High Extrovert caused that difference. In this study, the personality dimension "extroversion" would be considered a [Hint]

 A. true independent variable B. moderator variable C. mediator variable D. split-plot variable

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