CEE 110 09 Midterm and Solutions

CEE 110 09 Midterm and Solutions - UNIVERSITY OF...

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Page 1 of 7 UNIVERSITY OF CALIFORNIA, LOS ANGELES Civil and Environmental Engineering Department CEE 110 Introduction to Probability and Statistics for Engineers Spring Quarter 2009 M-W 2-4 PM 4000A Math Science Prof. K. D. Stolzenbach 5732J Boelter Hall, 206-7624 stolzenb@ucla.edu Midterm Exam (2:00-3:50 pm Wednesday May 6, 2009) 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 six 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 7 1. Three statistics classes all took the same test. 3% a) Match each the histogram of the scores for each class (1, 2, and 3), with the corresponding box plot (A, B, and C) 3% b) Describe the qualitative characteristics of each of the three grade distributions.
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Page 3 of 7 2. The distribution of 45 scores on a CEE 110 exam is summarized in the following stem and leaf plot: Exam scores 9 00011112222334799 8 00222455677899 7 114679 6 368 5 4 47 3 2 23 1 1 0 5% a) What is the first quartile score Q1? 5% b) If the mean score is x7 9 = and 2 x = 298,755, what is the standard deviation σ x ? 3. A total of 100 people of varying ages were surveyed to determine what kind of video game they liked to play. The results of the survey is shown on the table below.
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This note was uploaded on 10/22/2011 for the course ENG 101 taught by Professor Yukov during the Spring '11 term at UCLA.

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CEE 110 09 Midterm and Solutions - UNIVERSITY OF...

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