To find out if second hand smoke is causally linked to lung
To find out if second hand smoke is causally linked to lung diseases, the quickest way to get significant results would require using: (b) retrospective experiments. (b) prospective experiments. (c) randomized experiments.
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to discover whether hiv is transmitted by sexual intercourse the experimental method least likely to be used because it
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to find out if second hand smoke is causally linked to lung diseases the quickest way to get significant results would
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