Answer:
A control group is a set of experimental samples or subjects that are kept separate and aren't exposed to the independent variable. ... A controlled experiment is one in which every parameter is held constant except for the experimental (independent) variable. Essentially, a control variable is what is kept the same throughout the experiment, and it is not of primary concern in the experimental outcome. Any change in a control variable in an experiment would invalidate the correlation of dependent variables (DV) to the independent variable (IV), thus skewing the results.
Explanation:
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