A study of a program to help people quit cigarette smoking had three groups of subjects. The first group received one supportive phone call 10 days after attending a program on strategies to resist smoking. A second group received a supportive phone call every week for 6 weeks after attending the program. A third group received no supportive phone calls after attending the program.
-In the above scenario, which of these properties of experimental research is evident?
A) Quasi-experimental design with no control group
B) Random assignment to research groups
C) Manipulation of the treatment dose
D) Control of extraneous variables

Question

Quizplus · Accepted Answer

The scenario demonstrates manipulation of the treatment dose by varying the frequency of supportive phone calls among the groups.

A Study of a Program to Help People Quit Cigarette