Select Questions

Chapter 8

1. In a factorial design, subjects are matched on IQ and then one of each pair is randomly assigned to one of the treatments; the design is a __________.

randomized blocks design

repeated measures design

completely randomized design

Latin square design

2. A(n) ______ occurs when the effect of one variable, A, on another variable, X, depends on a third variable, B.

interaction

anomaly

main effect

regression

3. An experiment with two independent variables, each of which has two levels, in which all combinations of treatments are included, is called a(n) ________ design.

2x2 factorial

interaction

two-way factorial

multiple factor

4. A(n) __________ occurs when the effect of one variable, X, on another variable, Y, depends upon a third variable, Z.

main effect of X

main effect of Z

main effect of X and an interaction between X and Y

interaction

5. A __________ design is a design with two or more independent variables, in which the complete set of treatments is defined by the product of the levels of the independent variables.

factorial

completely randomized

randomized blocks

Latin square

6. In the two-factor design shown in the summary table below, there was/were __________ level(s) of Factor A, Drug.
Table
Analysis of Variance
Summary Table for Depression Scores
Source              df       F
A = Drug Th         1      1.86
B = Cog Beh Th     1     12.23*
A x B                  1       2.03
Error                30
* p < .05

7. Researchers have investigated the effect of exercise on depression. They have found that exercise decreases "feeling blue" in unipolar depressives but has no effect upon those suffering from seasonal affective disorder. The finding, that the effects of exercise depends upon diagnostic category, is an example of _________.

a main effect of diagnostic category

an interaction between treatment (exercise) and diagnostic category

a limited main effect of exercise

an interaction between diagnostic category and "feeling blue"

8. See the summary table below. In the analysis of this two-factor design, __________ F test(s) was/were computed.
Table
Analysis of Variance
Summary Table for Depression Scores
Source              df       F
A = Drug Th         1      1.86
B = Cog Beh Th     1     12.23*
A x B                  1       2.03
Error                30
* p < .05

9. In the analysis of the two-factor design shown in the summary table below, which F test(s) was/were statistically significant?
Table
Analysis of Variance
Summary Table for Depression Scores
Source              df       F
A = Drug Th         1      1.86
B = Cog Beh Th     1     12.23*
A x B                  1       2.03
Error                30
* p < .05

none of the F tests were statistically significant.

the F test showing the interaction effect, A x B

the F test showing the main effect of A (Drug Treatment)

the F test showing the main effect of B (Cognitive Behavior Therapy)

10. Most people thrive on a diet containing phenylalanine; only the rare people with phenylketonuria suffer brain damage because of it. This is an example of a(n):

main effect.

confounded effect.

interaction.

regression.

11. The degrees of freedom associated with the main effects and interaction in an analysis of variance depend on:

the degree of experimental control that is achieved.

the size of the study.

the context of the experiment.

the power of the statistical test.

12. The statistical test used to analyze the factorial design is called the __________.

chi-square

randomization test

F test

t test