Explain or give an example of given study

Reference no: EM131411650

Is it possible for each of the following to be used in the same study (on the same units)? Explain or give an example of such a study.

a. A placebo and a double-blind procedure.

b. A matched-pair design and a retrospective study.

c. A case-control study and random assignment of treatments.

Reference no: EM131411650

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