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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