A study published in 2010 in the New England Journal of Medicine discusses a breastcancerscreening program that
Question:
1. Women who from 1996 through 2005 were living in countries with screening.
2. Women who from 1996 through 2005 were living in countries without screening.
3. A historical-comparison group who lived in screening countries from 1986 through 1995.
4. A historical-comparison group who lived in non-screening countries from 1986 through 1995. Data were analyzed for 40,075 women. Rates of death were reduced in the screening group as compared to the historical screening group, and also in the non-screening group as compared to the historical non-screening group.
a. Is this an observational or experimental study?
b. Identify the explanatory and response variable(s).
c. Does the study prove that being offered mammography screening causes a reduction in death rates associated with breast cancer? Why or why not?
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Related Book For
Statistics The Art And Science Of Learning From Data
ISBN: 9780321755940
3rd Edition
Authors: Alan Agresti, Christine A. Franklin
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