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Based on this research scenario, explain why this study is classified as a laboratory experiment and how its setup relates to internal validity. In your response, explain how the combination of variable manipulation and environmental control allows the researcher to draw a strong causal conclusion.
Case context: A psychology researcher wants to investigate how background noise levels affect cognitive performance. To do this, she brings participants into a specialized testing room where temperature, lighting, and seating are kept identical. She randomly assigns participants to complete a test under one of two conditions: a silent environment or an environment with loud background music. By setting up the study this way, she ensures no external distractions or environmental factors interfere with the test results.
Question: Based on this research scenario, explain why this study is classified as a laboratory experiment and how its setup relates to internal validity. In your response, explain how the combination of variable manipulation and environmental control allows the researcher to draw a strong causal conclusion.
Sample answer: This study is a laboratory experiment because it is conducted in a highly controlled environment (the specialized testing room where temperature, lighting, and seating are kept constant). The researcher manipulates the independent variable (silent vs. loud music) and minimizes outside influences by keeping other factors constant. This highly controlled setup leads to high internal validity because it ensures extraneous factors do not interfere, allowing the researcher to conclude that any differences in cognitive performance were caused by the noise levels, thereby drawing a strong causal conclusion.
Key points:
- Identifies the specialized testing room with constant temperature, lighting, and seating as a highly controlled environment.
- Recognizes that the researcher is manipulating a variable (silent vs. loud background music).
- Explains that maintaining these controls minimizes outside influences to achieve high internal validity.
- Explains that high internal validity is what enables the researcher to draw a strong causal conclusion.
Rubric: A complete response must demonstrate comprehension by: 1. Explaining that the study is a lab experiment because it takes place in a highly controlled setting with constant temperature, lighting, and seating. 2. Explaining that variable manipulation (silent vs. loud music) and minimizing outside influences lead to high internal validity. 3. Linking high internal validity to the ability to draw a strong causal conclusion about noise level and performance.
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Research Methods in Psychology - 4th American Edition @ KPU
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