In John's study, he knows that each participant had an equal probability of being placed into each of his conditions. John must have used
a. external validity.
b. random assignment.
c. systematic sampling.
d. random sampling.
B
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The world's oldest well-known city, Jericho, is nearly
a. 5,000 years old. b. 7,500 years old. c. 10,000 years old. d. 12,500 years old.
Every two years the nation elects
a. all House members and one-third of the senators. b. all senators and one-third of the House members. c. the president and one-third of Congress. d. the president and all of Congress. e. one-third of the Congress.
A _____ allows for the analysis of the impact that control variables have on the relationship between two variables.
a. univariate analysis b. box and whisker plot c. cross-tabulation d. three-way contingency table
The principle of the most-favored nation status (MNF) essentially:
A. levels the playing field among trading partners. B. benefits states that trade a lot. C. benefits states that trade very little. D. allows states to privilege some trading partners. E. trade exclusively with a few countries.