____ methods allow a researcher to make a valid cause-and-effect statement about the variables in her study.

Question

BlackTom AI · Accepted Answer

Experimental methods allow a researcher to make a valid cause-and-effect statement because they deliberately manipulate an independent variable and control other factors so that changes in a dependent variable can be attributed to that manipulation.

1) Relevant knowledge points and concepts
- Causation vs. correlation: Correlation indicates a relationship; causation requires that one variable produces change in another. 
- Key features of experiments: manipulation of the independent variable, random assignment to conditions, control groups, and control of extraneous/confounding variables. These features increase internal validity—the degree to which observed effects can be attributed to the manipulated variable rather than alternative explanations.

2) Step-by-step reasoning
- Start with the research goal: to show that X causes Y. Observing that X and Y covary is necessary but not sufficient for causation. 
- Implement manipulation: the researcher systematically changes X (e.g., administers drug vs. placebo). 
- Use random assignment: participants are randomly placed into conditions so pre-existing differences are balanced across groups. 
- Control extraneous variables: conditions and procedures are held constant except for the manipulated variable, or statistical controls are used. 
- Observe outcome: if the dependent variable differs reliably between conditions, and alternative explanations have been controlled, the researcher can infer a causal effect of X on Y.

3) Calculations
- No numerical calculations are required for this conceptual question.

4) Why the correct answer is correct
- Experimental designs provide the procedural safeguards (manipulation, randomization, control) that establish temporal precedence, rule out confounds, and allow causal inference. This is the standard method used to test cause-and-effect hypotheses.

5) Why the other options are incorrect
- Cross-sectional: measures variables at one time point; cannot establish temporal order or manipulate variables, so causation is not supported. 
- Observational: involves recording behavior without intervention; can reveal associations but lacks manipulation and randomization. 
- Correlational: quantifies relationships between variables but cannot rule out third-variable confounds or reverse causation.

6) Conclusion
These points confirm that Experimental is the correct answer.

____ methods allow a researcher to make a valid cause-and-effect statement about the variables in her study. 单项选择题

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