Select Questions

Chapter 8

1. In a between-subjects design, each subject receives __________.
        
2. In a within-subjects design, the most likely threat to internal validity is __________.
        
3. 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
        
4. A study contains two factors, X and Y, each with two levels (present, absent). The possible treatments are __________.
        
5. Experiments which test for interactions must include at a minimum __________.
        
6. In a between-subjects design, a possible threat to internal validity is _________.
        
7. In a within-subjects design ___________.
        
8. In a factorial design, subjects are assigned completely at random to one of the treatments; the design is a __________.
        
9. In a two-factor design, the number of F tests performed is:
        
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.
        
11. 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.
        
12. 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 _________.