You are planning a prospective study to try to prove a cause and effect relationship between dipping snuff and throat cancer. First, you identify subjects who regularly dip snuff and who are free of any signs of throat cancer. Next, you need to identify subjects who

Question

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In a prospective study, you need a control group that does not have the exposure (dipping snuff) and is free of the outcome (throat cancer) to compare against the exposed group.

You Are Planning a Prospective Study to Try to Prove