# e1p - Math 127A(Practice exam The practice exam has 4...

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Math 127A (Practice exam) September 20, 2010 The practice exam has 4 problems. It is about the same length as the actual exam. It does not represent every type of problem. Question 1 Give one example each, from your own field of study or interest, of 1. an observational study. 2. a controlled experiment. Question 2 Suppose that winning margins in basketball games follow a normal curve with an average of 10 points and a standard deviation of 3 points. A close game is one that has a winning margin of two points or less. A thrashing (drubbing) is a game that has a winning margin of 15 points or more. A fair game is one in which the winning margin is within 1.5 standard deviations of the mean. 1. What percentage of games are close? a thrashing? 2. For what range of winning margins is a game fair? Question 3 The table below gives the price of electricity (in cents per kilowatt hour) in the 50 states and the District of Columbia.

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