Random selection helps to

A) assign subjects.
B) calculate the F-ratio.
C) clarify literature searches.
D) enhance external validity.

Answer: D

Political Science

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The expansion of American power in the post–World War II world has been accompanied by an increase in the power of __________

a. Congress b. interest groups c. the FBI d. the president

Political Science

Which of the following is NOT true regarding paid signature gathering in the United States? a. Petition management firms often offer proponents a guarantee of qualification, but at a price that runs close to$2 million

b. Paid signature gatherers have been known to earn a typical rate of $1 or $2 per valid signature. c. The U.S. Supreme Court upheld state laws in 1988 that banned the practice of paid signature gathering. d. Paid signature gathering, as an institution, allows wealthy groups and individuals to play a prominent, if notdominant, role in affecting what gets put to a public vote.

Political Science