Select Questions

Chapter 8

1. 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.

Latin square

factorial

randomized blocks

completely randomized

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

within-subjects design

randomized blocks design

completely randomized design

Latin square design

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

dealing with subject factors.

testing interactions.

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

balancing order effects.

4. 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.

5. 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

6. 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

7. 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

multiple factor

2x2 factorial

interaction

8. To evaluate the possibility of an interaction between Factors A and B:

the effects of A at each level of B are subtracted.

comparisons must be made of the effects of A at different levels of B.

the values for the effect of B at each level of A are multiplied.

none of the alternatives are correct

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

10. 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, three

four, one

one, four

four, three

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

only one treatment order

only one treatment

all treatments

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

12. 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