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An experimental study has found that alcoholics who attend peer group meetings are more successful in reducing their consumption of alcoholic beverages than alcoholics who do not attend such meetings. In the conclusions to their report on this experiment

Mechanism and context are necessary conditions for determining causality.

Researchers apply the term face validity to the confidence gained from:

Which of the following is not a property of a variable measured at the interval level?

Alternate forms reliability is different than test-retest reliability because:

External validity is another term for cross-population generalizability.

High school seniors in a small town are asked a series of questions to measure the frequency of their drinking and driving. The students give consistent answers to the series of questions

In a national survey of drug abuse

If you are only able to collect data at one point in time

A quota sample is equivalent to what type of a probability sample?