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Test Experimental research: establishing cause and effect

QUESTION 1: What is the only research method that has the ability to reliably establish a cause-and-effect relationship?

2nd QUESTION: What is the independent variable in an experiment?

QUESTION 3: What is the function of the control group in an experiment?

4th QUESTION: What is the dependent variable?

5th QUESTION: What is the experimental group?

QUESTION 6: When can it be concluded that manipulation was the cause of a change in an experiment?

QUESTION 7: What is the essence of every experiment?

QUESTION 8: Why is it essential to have a control group?

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