Select Questions

Chapter 8

1. Experiments which test for interactions must include at a minimum __________.

one independent variable and one dependent variable

two independent variables and one dependent variable

two independent variables and two dependent variables

one independent variable and two dependent variables

2. In a between-subjects design, a possible threat to internal validity is _________.

selection

maturation

history

testing

3. 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 __________.

repeated measures design

completely randomized design

randomized blocks design

Latin square design

4. Counterbalancing is a technique that can be used for:

testing interactions.

dealing with subject factors.

converting a between-subjects design to a within-subjects design.

balancing order effects.

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

F test

chi-square

t test

randomization test

6. 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

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

between-subjects

completely randomized

randomized blocks

Latin square

8. In a __________ design, each subject receives all the treatments; in a _________ design, each subject receives only one treatment.

factorial; nonfactorial

between-subjects; within-subjects

nonfactorial; factorial

within-subjects; between-subjects

9. In Hall and Kataria's study evaluating different treatments for attention deficit hyperactive disorder, the children were tested on a delayed response task both when they were taking Ritalin and when they were not. A variable such as this involving repeated testing of the same subjects is called:

a between-subjects factor.

an interaction.

a subject factor.

a within-subjects factor.

10. 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 interaction effect, A x B

none of the F tests were statistically significant.

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

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

11. A researcher investigates the influence of illumination levels (high, moderate, low) on reading speed, for texts varying in difficulty (complex, simple). In this factorial design, there are a total of __________ treatments.

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

between-subjects design

Latin square design

factorial design

within-subjects design