Question: An experiment that randomly assigned non smokers to two groups: an experimental group that was given 2 packs of cigarettes a day, and a control

An experiment that randomly assigned non smokers to two groups: an experimental group that was given 2 packs of cigarettes a day, and a control group which was prohibited from smoking would: provide experimental evidence that smoking causes lung cancer display a positive correlation be impractical, because the control group would be unlikely to remain in the study be unethical, and therefore could not be approved by an Institutional review board

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