Question: Randomized, controlled experiments have found that vitamin C is not effective in treating terminal cancer patients. However, a 1976 research paper reported that terminal cancer

Randomized, controlled experiments have found that vitamin C is not effective in treating terminal cancer patients. However, a 1976 research paper reported that terminal cancer patients given vitamin C survived much longer than did historical controls. The patients treated with vitamin C were selected by surgeons from a group of cancer patients in a hospital. Explain how this experiment was biased in favor of vitamin C.

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