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The Concept Map you are trying to access has information related to:
statistics level 1b, Manipulation of variables may include use of Quasi-independent variable, Scientific research requires distinction between Constants, Scales of Measurement include Ordinal, Manipulation of variables includes distinction between Dependent Variable, Manipulation of variables includes distinction between Independent variable, Control techniques include holding extraneous variable constant, Scales of Measurement include Interval, Experimental method is based on Manipulation of variables, Scientific research includes Experimental method, Correlational method is based on Observation of variables