Extraneous Variables and Confounding
From an experiment we can draw a causal inference about the relationship between the independent and dependent variables. If the value of the dependent variable changes significartly as the independent variable changes, We may say that the independent variables caused changes in dependent variable. But this inference is justified only when the experiment is well controlled. Many things other than the independent and dependent variables may be changing throughout an experiment – time of day, the experimenter’s level of fatigue, the particular subject who are being tested – such variables are called extraneous variables ; they are factor that are not the main focus of the experiment. They are neither intertionally manipulated independent variables nordependent variables measured as indexs of the effect of the independent variable. They can include differences among subjects, equipment failures, inconsistent instructions – in short, anything that varies. Extraneous variables.
Extraneous Variables and Confounding From an experiment we can draw a causal inference about the relationship between the independent and dependent variables. If the value of the dependent variable changes significartly as the independent variable changes, We may say that the independent variables caused changes in dependent variable. But this inference is justified only when the experiment is well controlled. Many things other than the independent and dependent variables may be changing throughout an experiment – time of day, the experimenter’s level of fatigue, the particular subject who are being tested – such variables are called extraneous variables ; they are factor that are not the main focus of the experiment. They are neither intertionally manipulated independent variables nordependent variables measured as indexs of the effect of the independent variable. They can include differences among subjects, equipment failures, inconsistent instructions – in short, anything that varies. Extraneous variables.
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