The observational researcher should always randomly assign the participants to the exposure.
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Q26: When are case-control designs appropriate to use?
A)
Q27: In case-control research design, researchers must ensure
Q28: A case-control research design is usually _.
A)
Q29: Researchers must ensure that the controls are
Q30: Ecological research design studies only be undertaken
Q32: Observational research examines the effects of exposure
Q33: An OR = 1 means exposure does
Q34: When data are collected on the exposure
Q35: The exposure variable in observational research could
Q36: How might external validity invalidate a study?
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