exam072 - Stat 500 Midterm 2 8 November 2007 page 0 of 4...

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Unformatted text preview: Stat 500 Midterm 2 8 November 2007 page 0 of 4 Please put your name on the back of your answer book . Do NOT put it on the front. Thanks. DO NOT START until I tell you to. You are welcome to read this front page. The exam is closed book, closed notes. Use only the formula sheet and tables I provide today. You may use a calculator. Write your answers in your blue book. Ask if you need a second (or third) blue book. You have 2 hours (120 minutes) to complete the exam. Stop working when the end of the exam is announced. Points are indicated for each question. There are 120 total points. Important reminders: budget your time. Some parts of each question should be easy; others may be hard. Make sure you do all parts you can. notice that some parts do not require any computations. show your work neatly so you can receive partial credit. Good luck! Stat 500 Midterm 2 8 November 2007 page 1 of 4 1. 45 points. Are baseball free agents worth it? After a professional baseballs player contract expires, that player becomes a free agent and is permitted to sell his services to the highest bidder. The salaries paid to free agents are often much higher than those paid to regular players. Do players perform better when paid higher salaries? The batting average is one measure of performance of a baseball player. Higher batting averages indicate better performance. Data were collected on 132 players who became free agents between 1976 through 1989. For each player, two batting averages were computed. PRE is the batting average the year before the player became a free agent. POST is the batting average the next year, after the player became a free agent. We want to make inferences about the mean difference in batting average. (a) These data are an example of: (write the numbers of all appropriate terms on your answer sheet) 1) Block design 2) Paired data 3) Randomized experiment 4) Observational data 5) Latin Square design (b) You want to test the null hypothesis that the difference (POST - PRE) = 0. Here are the(b) You want to test the null hypothesis that the difference (POST - PRE) = 0....
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This note was uploaded on 02/11/2012 for the course STAT 500 taught by Professor Staff during the Fall '08 term at Iowa State.

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exam072 - Stat 500 Midterm 2 8 November 2007 page 0 of 4...

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