Practical intelligence seems to decline throughout most of adulthood, with some later-life increase

Carlos died by intentionally stepping in front of a bullet that was intended for another young man, for whom Carlos, as head of a platoon of soldiers in the Persian Gulf War, was responsible. Emile Durkheim would call this an example of:

A) anomic suicide. B) egoistic suicide. C) imitative suicide. D) altruistic suicide.

What procedure can a researcher use to make sure that the various participant groups are kept roughly equivalent before exposure to an independent variable?

a. Snowball sampling b. Double-blind assignment c. Random assignment d. Single-blind sampling