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2015-09-26T16:41:21+08:00

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Variables in experiments are factors or condition that can be controlled or changed by the experimenter. 

Three types of variables
-Controlled variable: a variable that cannot be changed in any ways
-Independent variable: a variable that is manipulated by the experimenter
-Dependent variable: a variable that is being measured
                                                                                    -KookEin
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