Mathematics, 20.09.2020 18:01 gunnatvinson

Which of the following is not a characteristic of both surveys and observational studies?
O A. Results are not used to prove cause and effect.
B. The researcher does not control or change the population.
C. Data are collected about a population.
D. The researcher exercises direct control over at least one variable.

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Which of the following is not a characteristic of both surveys and observational studies?
O A...