Question

question 7
which of the following is the best description of a control experiment?
the control group is kept in an unchanging environment.
the control group is left alone by the experimenters.
the control group is matched with the experimental group except for the one experimental variable.
the control group is exposed to only one variable rather than several.
only the experimental group is tested or measured.

Explanation:

In a control experiment, the control group and experimental group are identical except for the one experimental variable being tested. This allows researchers to determine the effect of that variable.

Answer:

The control group is matched with the experimental group except for the one experimental variable.