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Mathematics, 25.08.2020 20:01 kamgurunlian

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

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