What is the preferred treatment for breast cancer that is detected in its early stages? The most common treatment was once removal of the breast. It is now usual to remove only the tumor and nearby lymph nodes, followed by radiation. To study whether these treatments differ in their effectiveness, a medical team examines the records of 25 large hospitals and compares the survival times after surgery of all women who have had either treatment.
True or false:
True
False
Answer: True
True or false:
The study is not an experiment because no treatment is actively imposed, and the patients or their doctors selected the treatment to be used.
True
False
Answer: True
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