Select Questions

Chapter 8

1. 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

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

none of the F tests were statistically significant.

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

the F test showing the interaction effect, A x B

2. In an experimental design, subjects receive all treatments, according to a predetermined order. The design is a __________ design.

completely randomized

randomized blocks

between-subjects

Latin square

3. In a two-factor design, the number of F tests performed is:

4. In a within-subjects design, the most likely threat to internal validity is __________.

statistical regression

instrumentation

testing

history

5. 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

Latin square design

repeated measures design

completely randomized design

6. The design that allows the researcher to test for interactions between variables is the __________.

factorial design

between-subjects design

within-subjects design

Latin square design

7. 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

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

main effect of X and an interaction between X and Y

main effect of X

main effect of Z

interaction

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

chi-square

randomization test

F test

t test

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

the size of the study.

the context of the experiment.

the degree of experimental control that is achieved.

the power of the statistical test.

11. A study contains two factors, X and Y, each with two levels (present, absent). The possible treatments are __________.

X1Y1, + X1Y2, + X2Y1

X1Y1, + X1Y2, + X2Y1, + X2Y2

X and Y

X1Y1, + X2Y2

12. In a within-subjects design ___________.

each subject receives only one treatment

each subject receives all treatments

there are two factors and at least one dependent variable

there are at least two factors and at least one dependent variable