The purpose of a control group in an experimental research study is to:
A) allow the researcher to have more groups and thus a better study.
B) allow the researcher to control all external factors in at least one group.
C) increase the ability of the researcher to find differences between experimental groups.
D) allow the researcher to determine the influence of some external factors that are not supposed to influence the results of the study.
E) meet the assumptions underlying the statistical test used in the study by making sure groups started off equal.
Correct Answer:
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