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
Political Science
You might also like to view...
_____ are used to predict expectations of theories that have yet to be observed.
a. Theories b. Conceptual definitions c. Hypotheses d. Null hypotheses
Political Science
A doctor wanted to learn about the use of preventive health care services among low-income men. She conducted a survey in the waiting room of the clinic where she worked. This type of sample is called
a. Convenience sampling b. Random sampling c. Systematic sampling d. Stratified sampling
Political Science