An _ involves introducing a change to the treatment group, whereas in an _, the treatment group is based on current behavior.
Correct answer: A. Experiment; observational study
- A. Experiment; observational study
- B. Observational study; experiment
- C. Observational study; observational study
- D. Experiment; experiment
Explanation
In an experiment, researchers introduce a change or intervention to the treatment group and observe the effects of that change. They manipulate variables to determine the causal relationship between the intervention and the outcomes.In an observational study, the treatment group is not subject to any intervention or change. Instead, researchers observe and analyze the existing behavior or characteristics of the participants to draw conclusions. Observational studies are more focused on observing and describing relationships rather than establishing causality.Therefore, Option A (experiment; observational study) is the correct choice that appropriately describes the distinction between the two types of studies.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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