CE 93 Midterm 1 2008 (2)

CE 93 Midterm 1 2008 (2) - University of California at...

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University of California at Berkeley Department of Civil & Environmental Engineering Structural Engineering Mechanics & Materials Instructor: Armen Der Kiureghian Student name:__________________________ CE 93 -- Engineering Data Analysis First Midterm Examination Thursday, October 9, 2008 9 -10 AM, 3108 Etcheverry Hall Work on all three problems. Write clearly and state any assumptions you make. The exam is closed books and notes. However, you can use one sheet of paper with your own notes. The problems have the following weights: Problem 1 (30 points) ________________________ Problem 2 (35 points) ________________________ Problem 3 (35 points) ________________________ Exam grade (100 points) ______________________
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Student name:__________________________________ 2 Problem 1. (30 points) The 48 2 matrix in the following Matlab session represents the monthly water demands in mil- lions of gallons for two cities (City A in column 1 and City B in column 2) in Central Florida for a four-year period. Carefully review the session and the generated figures and respond to the questions listed in the next page. The figures are shown in the order they are generated. >> whos Name Size x 48x1 y 48x1 >> boxplot(x(:,1)) >> figure >> boxplot(x(:,2)) >> mean(x) ans = 76.7271 660.4208 >> cov(x) ans = 1.0e+003 * 0.1081 0.1964 0.1964 6.3244 >> moment(x,3) ans = 1.0e+005 * -0.0004 2.1835 >> prctile(x,90) ans = 89.7000 764.9700 >> figure >> qqplot(x(:,1),x(:,2)) >> figure >> qqplot(x) 1 55 60 65 70 75 80 85 90 95 Values Column Number 1 500 600 700 800 900 Column Number 50 60 70 80 90 100 400 500 600 700 800 900 X Quantiles Y Quantiles -3 -2 -1 0 1 2 3 0 200 400 600 800 1000 Standard Normal Quantiles Quantiles of Input Sample QQ Plot of Sample Data versus Standard Normal
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CE 93 Midterm 1 2008 (2) - University of California at...

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