Question: A recent research study randomly divided participants into groups who were given different levels of Vitamin E to take daily. One group received only a

A recent research study randomly divided participants into groups who were given different levels of Vitamin E to take daily. One group received only a placebo pill. The research study followed the participants for eight years to see how many developed a particular type of cancer during the time period. Which of the following responses gives the best explanation as to the purpose of randomization in this study?

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