In experimental research, the ________ is a manipulated experimental factor, and the ________ is the outcome.

Question

In experimental research, the ________ is a manipulated experimental factor, and the ________ is the outcome.

BlackTom AI · Accepted Answer

The independent variable is the manipulated experimental factor; the dependent variable is the measured outcome.

1. Relevant knowledge points and concepts
- Independent variable (IV): the factor that the researcher intentionally changes or manipulates to test its effect.  
- Dependent variable (DV): the outcome or response that is measured and is expected to change as a result of manipulating the IV.  
- Confounding variable: an extraneous factor that varies with the IV and can provide an alternative explanation for observed changes in the DV. Good experimental design controls confounds.

2. Step-by-step reasoning process
- In experimental research the core logic is cause → effect. The researcher chooses a presumed cause (IV) and alters it across conditions or levels.  
- The researcher then measures an effect (DV) to see whether and how it changes in response to the IV.  
- If changes in the DV correspond to changes in the IV while confounds are held constant, one can infer a causal relationship.

3. Calculations or intermediate steps
- No numeric calculations are required for variable identification. Instead, apply the causal sequencing: manipulate → observe. Example: vary fertilizer amount (IV: fertilizer amount) and measure plant height (DV: plant height).

4. Why the correct answer is correct
- "Independent variable; dependent variable" matches the standard definitions: the IV is manipulated, the DV is the outcome. This phrasing directly captures the experimental manipulation and measured response relationship.

5. Why the other options are incorrect
- "Dependent variable; independent variable": reverses the roles, claiming the DV is manipulated and the IV is the outcome—incorrect.  
- "Confounding variable; independent variable": mislabels the manipulated factor as a confound and the outcome as an IV; a confound is not the intended manipulated factor.  
- "Dependent variable; confounding variable": also reverses and mislabels roles; a confounding variable is not the measured outcome.

6. Conclusion
The correct choice is "independent variable; dependent variable," which matches the provided answer.

In experimental research, the is a manipulated experimental factor, and the is the outcome.单项选择题

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In experimental research, the ________ is a manipulated experimental factor, and the ________ is the outcome.单项选择题