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Unformatted text preview: DEPARTMENT OF ECONOMICS ECON 131A YALE UNIVERSITY ECONOMETRICS & DATA ANALYSIS I FALL 2010 Assignment #1 Due Tuesday September 14 In Class You may work with a study group of your choice on this assignment. How- ever, even if you work with others you must write up and submit your own assignment. You may do your work by hand or in Excel, and you may hand in either handwritten answers or typed answers. Your grade depends on (1) getting the answer right, and (2) showing how you arrived at a correct answer. Late problem sets will not be accepted. 1. A recent report on small aircraft safety concluded that: • 10% of all emergency landings involve one or more fatalities. • 60% of all emergency landings are due to equipment malfunctions. • 15% of the emergency landings with one or more fatalities are due to equipment malfunctions. (a) If an emergency landing was not due to equipment malfunction, what is the probability that it involved one or more fatalities? (b) Are the events ”one or more fatalities” and ”due to equipment malfunc- tion” independent events? (c) What is the probability that an emergency landing was both due to equipment malfunction and involved one or more fatalities?...
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- social science background