Test_2_2008 - Department of Economics University of...

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Department of Economics Professor Dale J. Poirier University of California, Irvine December 9, 2008 FINAL EXAM ECON 220A Statistics and Econometrics I (open book) Directions : You must answer each of the following questions. Points (out of 100) are allocated as noted to the left of each question. Allocate your time according to these points. To receive any partial credit, you must show your work. (10) 1. Consider two events A and B with Prob(A) = 1/3 and Prob(B c ) = 1/4. Can A and B be disjoint? Explain. (20) 2. Suppose 1% of women over the age of 40 who participate in routine mammography screening have breast cancer, and that 80% of women with breast cancer have positive test results indicating breast cancer. Also assume 9.6% of women without breast cancer yield positive test results. If a woman has a positive test, then what is the likelihood she
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