
Concept explainers
The study is randomized comparative experiment or not.

Answer to Problem 11CR
The study is a randomized comparative experiment.
Explanation of Solution
Given:
The scenario is about the study .
Calculation:
In a randomized comparative experiment, subjects are randomly assigned to the control group or the treatment group.
The control group is the group that us subjected to no treatment.
The treatment group is the group that us subjected to the treatment.
The study is a randomized comparative experiment, as here the subjects (volunteers) are randomly divided into two groups, and are randomly assigned to the control group or the treatment group.
The treatment here is the new design for car wash.
The treatment group is the individuals who use the new design for car wash.
The control group is the individuals who use the old design for car wash.
Conclusion:
Hence, the study is a randomized comparative experiment.
Chapter 11 Solutions
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