In an experimental design, the variable the
researcher has control over and that is different for the treatment and control
groups is called the explanatory variable.
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The explanatory variable can be controlled and
manipulated by the experimenter.
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The correct answer between all
the choices given is the last choice or letter E. I am hoping that this answer
has satisfied your query and it will be able to help you in your endeavor, and
if you would like, feel free to ask another question.
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