The act of concealing or avoiding records of financial transactions that can be tracked is called:

Whether the participants are smokers, and thus tolerant to the effects of nicotine, is an important extraneous variable. Dr. Benning could control for this variable by

a) using only non-smokers. b) making smoking status another independent variable. c) matching the participants in the groups on their smoking frequency distribution. d) all of the above

Some groups pursue collective goods. A collective good is one that

A. is secured by the president. B. is provided by a public service organization. C. is secured by Congress. D. cannot be selectively granted or denied to individuals; it belongs to all. E. None of these answers is correct.