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.
Identify the explanatory and response variables in this study.
A.
Explanatory variable: Treatment method; Response variable: Survival times
B.
Explanatory variable: Removal or non-removal of breast; Response variable: Women with breast cancer
C.
Explanatory variable: Survival times; Response variable: Treatment method
D.
Explanatory variable: Women with breast cancer: Response variable: Removal or non-removal of breast
Answer: A.
Explanatory variable: Treatment method; Response variable: Survival times
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