Imagine that I conduct a study in which I follow identical twins who are adopted into different families. This is an example of:

Question

BlackTom AI · Accepted Answer

Studying identical twins raised apart isolates genetic from environmental influences, making it a natural or quasi-experimental design.

1) Relevant knowledge points and concepts
- True experiment: investigator randomly assigns participants to conditions/manipulations, controlling extraneous variables.
- Quasi-experiment (natural experiment): resembles an experiment but lacks random assignment; researchers take advantage of naturally occurring variations.
- Cross-sectional correlational study: measures variables at one time point to assess relationships (no manipulation, not longitudinal).
- Case-control study: retrospective comparison of participants with a condition (cases) and without (controls) to identify prior exposures.

2) Step-by-step reasoning
- Identical twins share the same genotype, so comparing twins raised in different families helps separate genetic from environmental effects.
- The researcher does not and cannot randomly assign twins to different adoptive families; adoption occurs through real-world processes.
- Because the key independent variable (family environment) is not experimentally assigned by the researcher, the design lacks true experimental control.

3) Intermediate “steps” (conceptual)
- Step A: Identify manipulation? No—environmental placement is not controlled by investigator.
- Step B: Is there random assignment? No—placement depends on adoption agencies/families.
- Step C: Is the design exploiting a natural variation to infer causality? Yes—this is characteristic of quasi-experiments/natural experiments.

4) Why the correct answer is correct
- The design uses naturally occurring placement of genetically identical individuals into different environments to infer causal influences without random assignment, which matches the definition of a quasi-experiment.

5) Why other options are incorrect
- Cross-sectional correlational study: typically one-time measurement of variables across subjects; twin rearing-apart studies are longitudinal and focus on causal inference from natural variation.
- Case-controlled study: involves retrospective comparison based on disease status, not twin adoption scenarios.
- True experiment: requires researcher-controlled random assignment, which is absent here.

6) Conclusion
Therefore, the study described is a Quasi-experiment, which matches the provided answer.

Imagine that I conduct a study in which I follow identical twins who are adopted into different families. This is an example of:单项选择题

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