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If a researcher designs a factorial experiment to test the effects of three different independent variables—temperature, humidity, and lighting—on plant growth, exactly how many potential main effects are there to consider in this study?
Question: If a researcher designs a factorial experiment to test the effects of three different independent variables—temperature, humidity, and lighting—on plant growth, exactly how many potential main effects are there to consider in this study?
Sample answer: There are exactly three potential main effects to consider, one for each of the three independent variables.
Key points:
- There are exactly three potential main effects.
- This is because an experiment has exactly one potential main effect for each independent variable it includes.
- The independent variables are temperature, humidity, and lighting.
Rubric: The student must correctly state that there are exactly three main effects, matching the number of independent variables.
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Research Methods in Psychology - 4th American Edition @ KPU
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If a researcher designs a factorial experiment to test the effects of three different independent variables—temperature, humidity, and lighting—on plant growth, exactly how many potential main effects are there to consider in this study?