In 2001, the conclusion of the study outlined in Exercise 41 was questioned. A new 9-year study was conducted in Sweden, comparing 21,088 women who had mammograms with 21,195 who did not. Of the women who underwent screening, 63 died of breast cancer, compared to 66 deaths among the control group.
a) Do these results support the effectiveness of regular mammograms in preventing deaths from Breast cancer?
b) If your conclusion is incorrect, what kind of error have you committed?