Question

5 why is the control group important? a it is used to compare what happens with and without the independent variable b it reveals other independent and dependent variables that may affect the experiment c it increases confidence that the hypothesis includes the correct variables

Explanation:

In experimental design, a control group is a group that does not receive the independent variable (the factor being tested). Its main purpose is to provide a baseline for comparison. Option A correctly states that the control group is used to compare the outcomes with and without the independent variable. Option B is incorrect because the control group doesn't reveal other variables; that's more about identifying confounding variables through other means. Option C is also incorrect as the control group's role isn't to increase confidence about the hypothesis's variables but to allow for a valid comparison.

Answer:

A. It is used to compare what happens with and without the independent variable