The HIP mammography study was one of the first and largest studies of the value of mammograms. The study began in New York in the 1960s and involved 60, 000 women randomly assigned to two groups—one that received mammograms, and one that did not. The women were then observed for the next 18 years. Of the 30, 000 who had mammograms, 153 died of breast cancer; of the 30, 000 who did not, 196 died of breast cancer. Compare the two sample proportions to see whether there is a statistically significant difference between the death rates of the two groups. (There is debate about the validity of the experimental protocol.)

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