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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.

a. Identify the explanatory and response variables in this study.
b. Is this an observational study or an experiment (describe)?
c. State a potential lurking variable for this study.

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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