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.
        
2. The statistical test used to analyze the factorial design is called the __________.
        
3. Most people thrive on a diet containing phenylalanine; only the rare people with phenylketonuria suffer brain damage because of it. This is an example of a(n):
        
4. The design that best controls for individual differences between subjects, using the fewest number of subjects, is the __________.
        
5. 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.
        
6. 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 __________.
        
7. 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
        
8. When comparing line and bar charts, __________.
        
9. The evidence for interactions can be seen most clearly in which of the following?
        
10. In a between-subjects design, a possible threat to internal validity is _________.
        
11. 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).
        
12. In a factorial design, subjects are assigned completely at random to one of the treatments; the design is a __________.