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We know that the proportion of women who have been diagnosed with breast cancer in the...

We know that the proportion of women who have been diagnosed with breast cancer in the general population is 0.013 or 1.3%. We think that a meaningful difference in proportion of women who have ever been diagnosed with breast cancer is |p0-p1| = 0.02 or 2% difference. for all cal. let alpha = 0.05

A. What sample size is needed to have 90% poor to detect this difference assuming that we use a two sided test.

B. If we have a sample size of 280 subjects, how much power does the test have.

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