Midterm Exam for Stat/For/Hort 571: Data Analysis in Soil Science and Agriculture, Exams of Data Analysis & Statistical Methods

Download Midterm Exam for Stat/For/Hort 571: Data Analysis in Soil Science and Agriculture and more Exams Data Analysis & Statistical Methods in PDF only on Docsity! Stat/For/Hort 571 Nordheim and Rasmussen October 12, 1999 Midterm I Name: For the section that you attend please indicate: Instructor:(circle one) Nordheim Rasmussen TA: (circle one) Cheng Sego Song Instructions: 1. This exam is open book. You may use textbooks, notebooks, class notes, and a calculator. 2. Do all your work in the spaces provided. If you need additional space, use the back of the preceding page, indicating clearly that you have done so. 3. To get full credit, you must show your work. Partial credit will be awarded. 4. Some partial computations have been provided on some questions. You may find some but not neces- sarily all of these computations useful. You may assume that these computations are correct. 5. Do not dwell too long on any one question. Answer as many questions as you can. 6. Note that some questions have multiple parts. For some questions, these parts are independent; in such cases you can work, for example, on part (b) or (c) separately from part (a). For graders’ use: Question Possible Points Score 1 20 2 16 3 24 4 20 5 20 Total 100 1. A soil scientist studies the thickness of the top layer of soil in a certain geological region. The scientist obtains a random sample of 15 thickness readings; the following are the data in cm. 9.9 11.5 12.8 9.1 11.6 12.1 10.9 12.6 10.9 8.3 10.5 8.0 10.3 13.2 11.9 Let yi be the thickness of the ith reading. The following information might be of value. n ∑ yi = 2454.0 ∑ y2 i = 1819.34 ( ∑ y2 i )/n = 121.289 ∑ yi = 163.6 1