Select Questions

Chapter 8

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

2. 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)

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

the F test showing the interaction effect, A x B

none of the F tests were statistically significant.

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.

two-way factorial

2x2 factorial

multiple factor

interaction

4. 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 __________.

Latin square design

randomized blocks design

repeated measures design

completely randomized design

5. In a factorial design, the total number of treatments __________.

equals the number of levels of the first independent variable plus the number of dependent variables

equals the number of independent variables

equals the product of the number of levels of each of the independent variables

equals the sum of the number of independent variables and the number of dependent variables

6. When comparing line and bar charts, __________.

neither is as good as a table

both are equally good at displaying study results

the line chart is superior to the bar chart at showing interactions

tables are better than either the line or bar chart at showing interactions

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

testing interactions.

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

balancing order effects.

dealing with subject factors.

8. In a factorial design, subjects are assigned completely at random to one of the treatments; the design is a __________.

Latin square design

within-subjects design

completely randomized design

randomized blocks design

9. 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 _________.

an interaction between treatment (exercise) and diagnostic category

a main effect of diagnostic category

an interaction between diagnostic category and "feeling blue"

a limited main effect of exercise

10. In a between-subjects design, each subject receives __________.

only one treatment

only one treatment order

only one treatment at one time and other treatments at later times to prevent carryover effects

all treatments

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

chi-square

F test

randomization test

t test

12. When factors such as age and sex, which are based upon characteristics of subjects, are used as a factor in a factorial design, __________.

results will probably not generalize

it may be because it is not feasible or ethical to manipulate that factor (e.g., stress).

subjects may be assigned in a completely random fashion

study results are easy to interpret