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Unformatted text preview: Page 1 of 4 ECO220Y: Homework, Lectures 5 & 6 Readings: Sections 4.1 – 4.3 Exercises: 4.2, 4.10, 4.22, 4.25 – 4.30, 4.40, 4.42, 4.46 (but these data not “this data”) Problems: (1) Considering the tabulation, find the mean, median, and mode of x. x  Freq. Percent Cum. + 0  6 3.77 3.77 .1  7 4.40 8.18 .2  16 10.06 18.24 .3  8 5.03 23.27 .4  10 6.29 29.56 .5  12 7.55 37.11 .6  12 7.55 44.65 .7  14 8.81 53.46 .8  9 5.66 59.12 .9  10 6.29 65.41 1  55 34.59 100.00 + Total  159 100.00 (2) For a sample size of 10, fill in values for the variable x such that the interquartile range is equal to the range and the variance of x is not zero. Fill in the data such that x is sorted from smallest to largest. i 1 2 3 4 5 6 7 8 9 10 X i (3) For this histogram, what is the approximate sample mean and sample standard deviation? (4) Which histogram shows the sample with the largest sample s.d.? Smallest? Explain the intuition. .1 .2 .3 .4 .5 Density 6 8 10 12 14 Sample 1 .05 .1 .15 .2 .25 Density 6 8 10 12 14 Sample 2 .1 .2 .3 .4 .5 Density 6 8 10 12 14 Sample 3 .005 .01 .015 .02 Density 50 100 150 200 x n: 278 Page 2 of 4 (5) Consider the following STATA summary of the variable age taken from the gasoline data posted on...
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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.
 Spring '11
 tanaka

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