A nurse researcher assigns half of a study sample to an experimental group and the other half of the study group to a control group.What does this represent regarding controlling for mediating variables?
A) Data-collection constancy
B) Manipulation of the mediating variable
C) Elimination of the mediating variable(s)
D) Manipulation of the independent variable

Question

Quizplus · Accepted Answer

Correct D: Administration of a program,treatment,or intervention to a treatment group,and not a control group,represents manipulation of the independent variable.
Incorrect A: Separating subjects into two groups (treatment versus control)does not represent data-collection constancy.
Incorrect B: A mediating or extraneous variable is usually controlled rather than manipulated.
Incorrect C: Separation of study subjects into treatment and control groups does not itself eliminate mediating variables.

A Nurse Researcher Assigns Half of a Study Sample to an Experimental