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Unformatted text preview: Page 1 of 3 ECO220Y: Homework, Lectures 11 & 12 Readings: Sections 7.1 7.2 Exercises: 7.2, 7.4, 7.5, 7.8, 7.16 7.18, 7.32 7.34, 7.36, 7.40 7.42, 7.47 7.50, 7.52, 7.54, 7.56, 7.58, 7.59 Problems: (1) Suppose you calculate x = $36, y = $60, s X = $12, s Y = $15, and s XY = -90. In the data x and y are measured in Canadian dollars. After youve done this analysis your boss informs you that she wanted these statistics in U.S. dollars and she wanted to know the variability of the difference between x and y (also in U.S. dollars). Revise the original statistics and provide the additional statistic. Show your work. (2) Create a new variable Z that is the variable X standardized to have mean 0 and variance 1. (Round to the first decimal place.) Show your work. For Questions (3) (4) : Consider the following four boxes full of balls. (3) Suppose you randomly take one ball from box 1, one ball from box 2, one ball from box 3, and one ball from box 4 and then calculate the mean of the numbers shown on the four balls. Define the random variable X to be box 4 and then calculate the mean of the numbers shown on the four balls....
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This note was uploaded on 03/01/2011 for the course ECON 220 taught by Professor Tanaka during the Spring '11 term at University of Toronto- Toronto.
- Spring '11