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

1		Your ability to distinguish between causal and correlational relationships depends on .
2		The behavior you record in a study is the .
3		Two ways to control the effects of extraneous variables are to and to .
4		You place the names of your participants on slips of paper and then assign them to treatment groups by pulling their names out of a hat. This illustrates .
5		In an experiment, participants in the group do not receive your experimental treatment.
6		In a(n) you expose a single group of participants to only one treatment condition.
7		Two types of variables that are often considered in correlational studies are and .
8		Two attributes of a research design that need to be carefully considered during the planning stages are the design’s and validity.
9		The presence of confounding variables in an experiment poses a serious threat to .
10		The time to be concerned with the internal validity of your experiment is .
11		The presence of a(n) interferes with establishing a clear causal connection between your independent and dependent variables.
12		The degree to which results from an experiment generalize to situations beyond the original research situation is called .
13		If you were conducting a laboratory experiment to test the validity of a particular theory, you would probably be more concerned with ; whereas if you were conducting a purely applied experiment, you would probably be more concerned with .
14		The degree to which a simulation minors a real-world phenomenon is whereas the degree to which it psychologically involves participants is .
15		An advantage of a field experiment is .