Question

question 5 of 7
a control group is used to
ensure that the results of the experiment are measurable.
ensure that the changes observed in the experiment are not caused by random factors.
ensure that the independent variable change is not responsible for the result.

Explanation:

A control group in an experiment is kept under normal conditions and serves as a baseline. It helps to isolate the effect of the independent variable by comparing the experimental group to it, thus ruling out random factors as the cause of observed changes.

Answer:

B. ensure that the changes observed in the experiment are not caused by random factors.