MidtermSolutionsA07(2) - Stat 311 Midterm 31 October 2007...

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Stat 311 Midterm Name:__________________ 31 October 2007 Section:__________________ This is a closed book exam. You are allowed, however, to use the formula card that came with the textbook and to have one sheet (double-sided) of 8.5 x 11 paper with notes, either handwritten or typed. You may also use a calculator, although be sure to show your work. The exam consists of five problems worth a total of 100 points. Point values for each part of a question are designated in parentheses at the beginning of the problem. Be sure to show your work as indicated in order to receive credit. 1
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2 Problem 1 (10+5+5): Shown below is a histogram for eight year crown masses for 17 Douglas Fir trees. Some summary statistics are also given. 0 50 100 150 200 250 Mass 0 2 4 6 Min Q1 Median Q3 Max 17.00 49.00 88.00 112.00 230.00 a) Describe the distribution of the 17 Douglas Fir trees. The distribution of the Douglas fir tree crown mass is unimodal and right-skewed. There are a couple of larger observations (200-250) range, which indicates there could be one or more outliers. b) Fill in the blank: Using the five number summary, a tree with a crown mass greater than 206.5 would be considered a potential outlier. Show your work in the space below.
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This test prep was uploaded on 04/07/2008 for the course PHI 311 taught by Professor Tamre during the Spring '08 term at University of Washington.

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MidtermSolutionsA07(2) - Stat 311 Midterm 31 October 2007...

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