Select Questions

Chapter 8

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

F test

randomization test

t test

chi-square

2. The evidence for interactions can be seen most clearly in which of the following?

a table of group means

a line chart

a scatterplot

a bar chart

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

two independent variables and one dependent variable

one independent variable and one dependent variable

two independent variables and two dependent variables

one independent variable and two dependent variables

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

factorial; nonfactorial

between-subjects; within-subjects

within-subjects; between-subjects

nonfactorial; factorial

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

X and Y

X1Y1, + X1Y2, + X2Y1, + X2Y2

X1Y1, + X1Y2, + X2Y1

X1Y1, + X2Y2

6. 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.

multiple factor

2x2 factorial

two-way factorial

interaction

7. A researcher investigates the effect of caffeine on problem solving speed. She administers either a placebo, 1, 2, or 5 mg of caffeine to subjects and measures the average time it takes them to solve three problems. This design contains _______________ factor(s) with __________ level(s).

four, three

one, four

four, one

one, three

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

interaction

main effect of X

main effect of Z

main effect of X and an interaction between X and Y

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

within-subjects design

completely randomized design

Latin square design

randomized blocks design

10. 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.

11. 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 main effect of B (Cognitive Behavior Therapy)

the F test showing the interaction effect, A x B

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

12. 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