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In psychological research, the independent variable plays a central role in establishing causal relationships. Analyze how the definition and handling of the independent variable change when moving from a true experimental design to a non-experimental or factorial design. In your analysis, explain the relationship between manipulation, measurement, and the determination of cause-and-effect.
Question: In psychological research, the independent variable plays a central role in establishing causal relationships. Analyze how the definition and handling of the independent variable change when moving from a true experimental design to a non-experimental or factorial design. In your analysis, explain the relationship between manipulation, measurement, and the determination of cause-and-effect.
Sample answer: In a true experimental design, the independent variable is defined as the presumed cause and is systematically manipulated or varied by the researcher to observe its direct impact on another variable. In contrast, in non-experimental or certain factorial designs, the independent variable is not manipulated but is instead simply measured as it naturally occurs. While manipulation is a requirement for true experiments to establish cause-and-effect relationships, simply measuring the independent variable in non-experimental designs limits the researcher's ability to assert causal relationships, as they cannot control the variation in the presumed cause.
Key points:
- The independent variable is the presumed cause in a cause-and-effect relationship.
- Experimental research requires the researcher to systematically manipulate or vary the independent variable.
- In non-experimental or factorial designs, the independent variable may simply be measured rather than manipulated.
- Manipulation is crucial for establishing clear cause-and-effect relationships between variables.
Rubric: Grading Criteria: 1. Clearly identifies the independent variable as the presumed cause in a cause-and-effect relationship (25%). 2. Explains that the independent variable is systematically manipulated in experimental designs but may simply be measured in non-experimental or factorial designs (50%). 3. Analyzes the implications of manipulation versus measurement on establishing cause-and-effect relationships (25%).
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Research Methods in Psychology - 4th American Edition @ KPU
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Identifying Experimental Variables
Extraneous Variable
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Non-Experimental Research
Non-Manipulated Independent Variable
Operational Definition
Experimental Manipulation
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Internal Validity
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