Fill in the blanks with the word or phrase that best completes each sentence.

1		Between-subjects and within-subjects components are both included in a(n) design.
2		If you need to test participants in large groups, a(n) design can be useful.
3		A correlational variable (for example, gender) you include in an experiment to statistically control is known as a(n) .
4		A(n) is a correlational variable that resembles a true independent variable in an experiment.
5		The potential for frequently misinterpreting results is a problem associated with .
6		In a design, you make several observations before and after introducing an independent variable.
7		A nonexperimental design in which you chart behavior as a function of a naturally occurring event is the design.
8		In the design, the independent variable is administered repeatedly.
9		In the design, one group of participants is exposed to your independent variable and another, different group, is not.
10		Unlike quasi-experimental designs like the time series design, the pretest—posttest design is .
11		The design allows you to test for pretest sensitization effects.
12		In a developmental design, the age of a participant is always considered to be a(n) .
13		In the design, you select participants from two or more age groups and study them over a short period of time.
14		, which may affect the results of a cross-sectional study, may occur when participants of widely differing ages are used.
15		In a design, a group of subjects is followed over some period of time and measured repeatedly.
16		Because of , the results from a longitudinal study may not generalize very well.
17		Two disadvantages of the longitudinal developmental design are and .
18		The design allows you to test for the presence of generation effects.
19		The cohort-sequential design includes both a(n) component and a(n) component.