Question

Why is it important that an experiment include a control group?

A) Without a control group, there is no basis for knowing if a particular result is due to the variable being
tested.
B) The control group is the group that the researcher is in control of, the group in which the researcher
predetermines the results.
C) A control group assures that an experiment will be repeatable.
D) A control group is required for the development of an "If "statement.
E) The control group provides a reserve of experimental subjects.

Answer 1

A control group is important in an experiment because it provides a basis for comparison and allows researchers to determine if the variable being tested is responsible for any observed effects. The option (A) is correct.

Step-by-step explanation:

A control group is important in an experiment because it provides a basis for comparison. Without a control group, it would be difficult to know if the results observed in the experimental group are due to the variable being tested or if they are the result of other factors. The control group is not exposed to the experimental manipulation and serves as the baseline for measuring the changes in the dependent variable.

For example, in a study testing the effectiveness of a weight-loss drug, the control group would be given a placebo instead of the drug, allowing researchers to determine if the drug itself is responsible for any observed effects. Therefore, option (A) is correct.