This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: 1 STAT 350 MidTerm I (10/3/2011) Fall 2011 Section (circle): 12:30 pm 2:30 pm 3:30 pm Name: ___ KEY ___________________________________ INSTRUCTIONS 1. Calculators (using the programmable features will not help you since ALL work including integration steps are required to receive full credit) and your cheat sheet are allowed. Exam is closed book/closed notes. 2. There are 5 pages front and back for the exam in addition to the cover sheet. You may tear off the last page (table) to make your work easier. However, this sheet must be returned. 3. All numeric answers must have at least 3 decimal places. 4. Work is required to receive credit. Partial credit will be given for work that is partially correct. Points will be deducted for incorrect work even if the final answer is correct. 5. Please attach your cheat sheet, table and any scrap paper used to the exam. 6. Good Luck! Question Possible Score 1 21 2 12 3 15 4 17 5 17 6 12 7 14 Total 108 2 (21 pts.) 1. Multiple choice questions. Please circle your answer. There is only one correct answer for each choice. (3 pts. each) a) The following is a histogram of drill lifetimes (number of holes that the drill can make before it breaks) when holes were drilled in a certain brass alloy. i) Which of the following codes was used to create the histogram? A) proc univariate data=1a; histogram lifetime; run ; B) proc univariate data=1a; qqplot lifetime; run ; C) proc univariate data=1a; histogram lifetime/endpoints= to 550 by 50 ; run ; ii) What is the shape of the histogram? A) negatively skewed B) symmetric C) positively skewed b) In the following cases, indicate whether the situations provided are examples of experiments or observational studies. i) In a study of the relationship between birthweight and race, birth records of babies born in Illinois were examined. The researchers found that the percentage of low birthweight babies among babies born to U.S.-born white women was much lower than the percentage of low birthweight babies among babies born to U.S.-born black women. babies born to U....
View Full Document
This note was uploaded on 03/26/2012 for the course STAT 350 taught by Professor Staff during the Spring '08 term at Purdue University.
- Spring '08