Which of the following is an identifying mark of an observational study?

A. Observational studies are controlled experiments.
B. Subjects are often given a placebo or harmless pill that they believe is actually an effective treatment.
C. Researchers observe but do not interact with subjects in an experiment.
D. Subjects in the study are put into the treatment group or the control group either by their own action or decision of someone not involved in the research study.

Question

Which of the following is an identifying mark of an observational study?

A. Observational studies are controlled experiments.
B. Subjects are often given a placebo or harmless pill that they believe is actually an effective treatment.
C. Researchers observe but do not interact with subjects in an experiment.
D. Subjects in the study are put into the treatment group or the control group either by their own action or decision of someone not involved in the research study.

Anonymous · Answer

Divide 77 by 28. Get 2.75. That is 2 hours and 45 minutes.

samanthaglitter · Answer

2.75 hours ;

Answer (2)

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