Answer :
The control group is used to create a cause and effect relationship by isolating the effect on the independent variable. It means that any adjustment in the dependent variable can be applied to the independent variable. It is the standard comparison.
Dependent variable is the variable being measured or tested. It is dependent on other variable.
Independent variable is the variable that is manipulated or changed. It stands alone and isn't changed by the other variables.
Answer - control group - non-colored ice cream
dependent variable - number of scoops purchased
independent variable -color of the ice cream