1. The degrees of freedom associated with the main effects and interaction in an analysis of variance depend on:
2. A study contains two factors, X and Y, each with two levels (present, absent). The possible treatments are __________.
3. Counterbalancing is a technique that can be used for:
4. In a between-subjects design, each subject receives __________.
5. The design that best controls for individual differences between subjects, using the fewest number of subjects, is the __________.
6. 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).
7. In a within-subjects design ___________.
8. In a __________ design, each subject receives all the treatments; in a _________ design, each subject receives only one treatment.
9. 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 __________.
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. The design that allows the researcher to test for interactions between variables is the __________.
12. 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):
