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Describe the inherent trade-off between internal validity and external validity when comparing experimental and correlational research designs. Specifically, recall why correlational studies typically exhibit low internal validity but high external validity.
Question: Describe the inherent trade-off between internal validity and external validity when comparing experimental and correlational research designs. Specifically, recall why correlational studies typically exhibit low internal validity but high external validity.
Sample answer: There is a direct trade-off between internal and external validity in research. Experimental research maximizes internal validity through strict control and manipulation of variables, but this often introduces artificial conditions. Conversely, correlational studies have low internal validity because the researcher does not manipulate or control any variables. However, because variables in correlational research are measured exactly as they naturally occur, the statistical relationships are more likely to represent real-world phenomena, resulting in higher external validity.
Key points:
- Experiments prioritize control/manipulation to maximize internal validity, often creating artificial conditions.
- Correlational studies do not manipulate or control variables, leading to low internal validity.
- Correlational studies measure variables exactly as they naturally occur.
- Measuring variables naturally makes correlational findings more likely to reflect real-world phenomena, yielding high external validity.
Rubric: The student response must accurately recall that: 1. Experiments maximize internal validity through control but can introduce artificial conditions. 2. Correlational studies have low internal validity because nothing is manipulated or controlled by the experimenter. 3. Correlational studies have higher external validity because variables are measured exactly as they naturally occur, making the results more reflective of real-world relationships.
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Research Methods in Psychology - 4th American Edition @ KPU
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