1. In a two-factor design, the number of F tests performed is:
2. The statistical test used to analyze the factorial design is called the __________.
3. The design that best controls for individual differences between subjects, using the fewest number of subjects, is the __________.
4. 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 __________.
5. A(n) ______ occurs when the effect of one variable, A, on another variable, X, depends on a third variable, B.
6. The degrees of freedom associated with the main effects and interaction in an analysis of variance depend on:
7. In a factorial design, the total number of treatments __________.
8. 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.
9. In a between-subjects design, a possible threat to internal validity is _________.
10. To evaluate the possibility of an interaction between Factors A and B:
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. Factorial designs are used when the researcher wishes to measure the effect of an independent variable __________.
