Why is it important that an experiment include a control group?
A) a control group assured that an experiment will be repeatable.
B) without a control group, there is no basis for knowing if a particular result is due to the variable tested or to some other factor.
C) the control group is the group that the researcher is in control of; it is the group in which the researcher predetermines the nature of the results.
D) the control group provides the reserve of an experimental subjects.
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