An urban community clinic wants to try a new method of getting drug addicts to kick their addiction. They advertise for participants in their lobby, and allow volunteers to choose to participate either in the treatment or control group
Three months later, they find that 65% of the volunteers are off drugs. This example illustrates the possibility of ________________ as a plausible rival hypothesis.
a. history
b. maturation
c. regression artifact
d. selection
D
You might also like to view...
Annexation, or the process where a city assumes control of neighboring unincorporated land, is regulated by
a. the federal government. b. state laws and constitutions which vary from state to state. c. county and municipal charters that outline the rules for annexation under state law. d. county commissioners.
By introducing citizens to candidates and showing members how to speak in public, compromise, and conduct meetings, parties deepen their __________
A) political competence B) understanding of bipartisanship C) regional interest D) trenchant liberal views
Which of the following statements regarding the population of unauthorized immigrants in the United States is true?
A. It is about 500,000 and increasing. B. It is about 1 million and stable. C. It is about 7 million and declining. D. It is about 11 million and stable. E. It is about 32 million and increasing.
On which of the following do voters increasingly rely for political information and knowledge?
A. magazines and periodicals B. the Internet and cellular phones C. public meetings and candidate appearances D. newspapers and television E. postal information and peer groups