To study the effects of noise on worker productivity,researchers have one group of people work in a noisy room and a second group work in a quiet room.To be sure that any differences in the productivity of the two groups actually result from the different noise levels,the researcher should use
A) the case study.
B) correlational measurement.
C) naturalistic observation.
D) random assignment.

Question

Quizplus · Accepted Answer

Random assignment is the best method to ensure that the different noise levels are the only variable that differs between the two groups, as participants are randomly assigned to either the noisy or quiet room. This minimizes the possibility of confounding variables affecting the results. The other options (case study, correlational measurement, naturalistic observation) do not provide this level of control over extraneous variables.

To Study the Effects of Noise on Worker Productivity,researchers Have