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Based on the definition of a confounding variable in psychological research, define what a confounding variable is. In your answer, explain how it behaves in relation to the independent variable and describe the primary scientific challenge it introduces when researchers attempt to establish a cause-and-effect relationship.
Question: Based on the definition of a confounding variable in psychological research, define what a confounding variable is. In your answer, explain how it behaves in relation to the independent variable and describe the primary scientific challenge it introduces when researchers attempt to establish a cause-and-effect relationship.
Sample answer: A confounding variable is an extraneous variable that differs on average across levels of the independent variable, meaning it varies systematically alongside it. Because it co-varies with the independent variable, it provides a plausible alternative explanation for any observed difference in the dependent variable. This makes it difficult for researchers to establish a clear cause-and-effect relationship between the independent and dependent variables.
Key points:
- A confounding variable is an extraneous variable that varies systematically alongside the independent variable.
- It differs on average across the different levels or conditions of the independent variable.
- It provides a plausible alternative explanation for any observed differences in the dependent variable.
- Its presence makes it difficult or impossible to establish a clear cause-and-effect relationship.
Rubric: To receive full credit, the response must state that a confounding variable is an extraneous variable that varies systematically or differs on average across the levels of the independent variable. It must also explain that the confounder provides an alternative explanation for differences in the dependent variable, thereby preventing a clear cause-and-effect conclusion.
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Research Methods in Psychology - 4th American Edition @ KPU
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