Select Questions

Chapter 8

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

regression

anomaly

interaction

main effect

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

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

completely randomized

between-subjects

Latin square

randomized blocks

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

only one treatment order

only one treatment

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

all treatments

5. 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.

a subject factor.

a within-subjects factor.

an interaction.

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.

2x2 factorial

interaction

two-way factorial

multiple factor

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).

one, four

one, three

four, one

four, three

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

the power of the statistical test.

the size of the study.

the context of the experiment.

the degree of experimental control that is achieved.

9. 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

10. 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

Latin square

randomized blocks

11. In a within-subjects design ___________.

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

each subject receives only one treatment

there are two factors and at least one dependent variable

each subject receives all treatments

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

X and Y

X1Y1, + X2Y2

X1Y1, + X1Y2, + X2Y1

X1Y1, + X1Y2, + X2Y1, + X2Y2