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3)

Experimental group - Those that received the placebo

Control group - Those that received surgery

Dependent variable - Kind of treatment for knee problem

4)

Experimental variable - Use of repellant

Independent variable - Use of repellant

Dependent variable - Deer population around the trees

Control - Trees without the tiger urine

Controlled variables - Specie of the deer, specie of tiger producing the urine.

What is an experiment?

We can see that in each case, the experiment is trying to establish a cause and effect relationship. This implies, does X lead to Y? Each experiment must have a dependent variable that changes and an independent variable that is manipulated.

3)

Experimental group - Those that received the placebo

Control group - Those that received surgery

Dependent variable - Kind of treatment for knee problem

4)

Experimental variable - Use of repellant

Independent variable - Use of repellant

Dependent variable - Deer population around the trees

Control - Trees without the tiger urine

Controlled variables - Specie of the deer, specie of tiger producing the urine.

Learn more about experiment:https://brainly.com/question/11256472

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