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As part of an early study of early detection of breast cancer in the 1960s, 31,000 women in New York were offered screening mammograms. Of these women, 20,200 accepted the screening, while 10,800 refused. Of those that chose to have screening, 23 died from breast cancer in the five years following screening. Of those that refused screening, 16 died of breast cancer in the five years following screening. Does the above data prove that screening reduces womens deaths from breast cancer? Explairn why or why not.

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