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CEE 110 10 Midterm and Solutions

# CEE 110 10 Midterm and Solutions - UNIVERSITY OF CALIFORNIA...

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Page 1 of 6 UNIVERSITY OF CALIFORNIA, LOS ANGELES Civil and Environmental Engineering Department CEE 110 Introduction to Probability and Statistics for Engineers Spring Quarter 2010 M-W 2-4 PM Young Hall CS 24 Prof. K. D. Stolzenbach 5732J Boelter Hall, 206-7624 [email protected] Midterm Exam (2:00-3:50 pm Wednesday May 12, 2010) Students are allowed to bring one page (both sides, approximately 8.5 × 11 inches) of summary notes with them into the examination room. No other material such as textbooks, class notes, or homework is permitted. The exam has five problems with multiple parts. The credit for each part is indicated. Before you start, make sure all pages of your examination are legible. If you have to leave the room for any reason during the exam, please do so quietly without asking. If you have a question during the exam, raise your hand and, if you are in the center of a row, come to the side isle. Full credit will be given for answers that are worked out correctly, even if the numerically correct answer is not obtained. You may leave your answer in terms of a correct symbolic equation if you like. To obtain credit, be sure to show as much work as possible! There are no long or tricky answers. If you find yourself doing anything long or tricky, stop and reevaluate your approach. Useful formulas and tables are included at the end of the exam.

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Page 2 of 6 1. The dot plot below shows the results of 31 measurements of the modulus of elasticity of steel samples (in 10 6 psi). 4% a) Describe qualitatively the characteristics of the distribution of values of the modulus. 8% b) Make a stem and leaf plot of the data. You may use the axis below or make your own on a separate sheet of paper. - - - - - - - - - - 8% c) Make a box plot of the data. You may use the axis below or make your own on a separate sheet of paper. Label the plot and show any calculations you make. 40 - - 30 - - 20 - - 10 - - 0 -