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Evaluate the validity of the following statement: 'By using partial correlation to control for participant age, we have completely eliminated the third-variable problem and established a causal relationship between coffee consumption and memory performance.' Explain why you agree or disagree in two to three sentences.
Question: Evaluate the validity of the following statement: 'By using partial correlation to control for participant age, we have completely eliminated the third-variable problem and established a causal relationship between coffee consumption and memory performance.' Explain why you agree or disagree in two to three sentences.
Sample answer: This statement is invalid. While partial correlation allows researchers to statistically control for age, it does not eliminate the third-variable problem because other unmeasured third variables may still drive the relationship. Additionally, partial correlation cannot resolve the directionality problem, meaning it remains impossible to draw definitive causal conclusions.
Key points:
- Evaluating the claim as invalid.
- Explaining that unmeasured third variables still pose a threat.
- Explaining that the directionality problem prevents causal conclusions.
Rubric:
- Student evaluates the statement as invalid. 2. Student explains that other unmeasured third variables could still drive the relationship. 3. Student explains that the directionality problem remains unresolved, preventing causal conclusions.
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Research Methods in Psychology - 4th American Edition @ KPU
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Evaluate the validity of the following statement: 'By using partial correlation to control for participant age, we have completely eliminated the third-variable problem and established a causal relationship between coffee consumption and memory performance.' Explain why you agree or disagree in two to three sentences.