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Analyze this research scenario to explain which findings can support causal claims and which cannot. Justify your answer by explaining the differences in participant assignment and control between the two independent variables.
Case context: A research team investigates the factors influencing task performance. They randomly assign participants to complete a task in either a quiet environment or a noisy environment (manipulated variable). They also measure participants' baseline levels of trait anxiety (non-manipulated variable) and categorize them into high and low anxiety groups. The team finds that performance is higher in the quiet environment and also higher among participants with low trait anxiety.
Question: Analyze this research scenario to explain which findings can support causal claims and which cannot. Justify your answer by explaining the differences in participant assignment and control between the two independent variables.
Sample answer: The researchers can draw a causal conclusion regarding the environment (quiet vs. noisy) because they systematically manipulated this variable and randomly assigned participants to the conditions. They cannot draw a causal conclusion regarding trait anxiety because they did not manipulate it or randomly assign participants to anxiety conditions. The relationship between trait anxiety and performance is strictly correlational, as an unmeasured third variable might be responsible for the observed effect.
Key points:
- Causal claims are only justified for the environment variable.
- No causal claims can be made for trait anxiety because participants are not randomly assigned to anxiety levels.
- An unmeasured third variable could explain the connection between trait anxiety and task performance.
- The relationship between trait anxiety and performance remains strictly correlational.
Rubric: The response must correctly identify that: 1. Only the environment (manipulated variable) supports causal conclusions. 2. Trait anxiety (non-manipulated variable) does not support causal conclusions. 3. The reason for this difference is the presence or absence of random assignment or systematic control. 4. The trait anxiety findings are strictly correlational and subject to third-variable explanations.
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Research Methods in Psychology - 4th American Edition @ KPU
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