Which type of congressional committee is permanent and reports to the full chamber?

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

Which of the following is NOT a power of the Leader?

a. He can mediate between the legislature, the executive, and the judiciary. b. He chooses the president. c. He is commander-in-chief. d. He has extensive appointment and removal powers over the judiciary. e. He can nominate clerics to the Guardian Council.