Percentages: The most useful statistics ever invented
Suppose that the probability of getting breast cancer is 1% (10 chances in 1000). For every group of 1000 women tested, 10 of whom have breast cancer and 990 of whom do not, 9 of those who have it will be correctly identified (since the test’s sensitivity is 90%, and 90% of 10 is 9). ................
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