# HW3.pdf - Exercise 2 Chapter 2 : Descriptive statistics 1....

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Exercise 2 Chapter 2: Descriptive statistics 1.Over the past month, Bob's bowling score mean was 182 with a standard deviation of 9.1. His bowling partner Cedric's mean was 152 with a standard deviation of 7.6. Which bowler is more consistent in relative terms?
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2. a) Find the coefficient of variation for prices of these three stocks. (b) Which stock has the greatest relative variation? (c) To measure variability, why not just compare the standard deviations?
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3. In fuel economy tests in city driving conditions, a hybrid vehicle's mean was 43.2 mpg with a standard deviation of 2.2 mpg. A comparably sized gasoline vehicle's mean was 27.2 mpg with a standard deviation of 1.9 mpg. Which vehicle's mpg was more consistent in relative terms?
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4.Scores on an accounting exam ranged from 42 to 96, with quartiles Q1 = 61, Q2 77, and Q3 = 85. (a) Sketch a simple boxplot (5-number summary without fences) using a nicely scaled X-axis. (b) Describe its shape (skewed left, symmetric, skewed right).
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5.In 2007, total compensation (in thousands of dollars) for 40 randomly chosen CEOs ranged from 790 to 192,920, with quartiles Q1 = 3,825, Q2 = 8,890, and Q3 = 17,948. (a) Sketch a simple boxplot (5-number summary without fences) using a nicely scaled X-axis. (b) Describe its shape (skewed left, symmetric, skewed right).
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6.Waiting times (minutes) for a table at Joey's BBQ on Friday at 5:30 p.m. have quartiles Q1 = 21, Q2 = 27 and Q3 = 33. Using the inner fences as a criterion, would a wait time of 45 minutes be considered an outlier?
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