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exam072

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

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Stat 500 Midterm 2 – 8 November 2007 page 1 of 4 1. 45 points. Are baseball free agents ‘worth it’? After a professional baseball’s 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
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exam072 - Stat 500 Midterm 2 8 November 2007 page 0 of 4...

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