ye6zys ye6zys
  • 17-05-2023
  • Biology
contestada

Which of the following is not a characteristic of both surveys and
observational studies?
OA. The researcher does not control or change the population.
B. Data are collected about a population.
OC. The researcher selects a sample of the population to study.
OD. The researcher exercises direct control over at least one variable.

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