Randomization in selection and assignment can control
A) only one variable at a time.
B) for threats to external validity but not for threats to internal validity.
C) for many variables simultaneously.
D) for threats to internal validity but not for threats to external validity.
Answer: C
You might also like to view...
The concept of __________ holds that national and state governments are supreme in their respective spheres and that these spheres should be kept separate.
A. dual federalism B. cooperative federalism C. antifederalism D. confederation E. state sovereignty
The individual mandate requires
a. every Texan age 16 or younger to attend school. b. every employed Texan to pay income tax. c. everyone who drives to have automobile liability insurance. d. every individual who can afford health-care insurance but is uninsured, to purchase it. e. individuals to participate in executing unfunded mandates.
The "phony war" refers to
a. Germany's preemptive strike against Holland, Belgium, and France b. The diplomatic bickering that came in response to Hitler's capture of Czechoslovakia c. Hitler's violation of the Munich pact with Britain d. The temporary quiet that ensued after Germany took Poland e. The quiet period that ensued after the British had to evacuate the port of Dunkirk
Jefferson and Madison secretly authored the Virginia and Kentucky Resolutions, which declared that the states did not have to obey __________ national laws and left it to the states to decide which laws fit into that category
a. unconstitutional b. constitutional c. progressive d. untested