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What type of research design is the gold standard for producing reliable evidence about cause and...

What type of research design is the gold standard for producing reliable evidence about cause and effect relationships

a. controlled trial without randomization

b. control trial with randomization

c. observational study

d. case control study

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Answer #1

ANSWER.

b. Type of research design is a gold standard for producing reliable evidence

     about cause and effect relationships is controlled trial with randomization.

* In controlled trial with randomization researcher eliminate most of the bias may

occur in a cause and effect study by random selection of people to conduct a study.

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