[Solution Library] Treating breast cancer. The most common treatment for breast cancer was once removal of the breast. It is now usual to remove only the
Question: Treating breast cancer. The most common treatment for breast cancer was once removal of the breast. It is now usual to remove only the tumor and nearby lymph nodes, followed by radiation. The change in policy was due to a large medical experiment that compared the two treatments. Each treatment was given to a separate group of breast cancer patients, chosen at random. The patients were closely followed to see how long they lived following surgery. What are the explanatory and response variables? Are they categorical or quantitative variables?
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