PracticeExamFinal3024

PracticeExamFinal3024 - STA 3024 Exam 3 Practice Problems...

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STA 3024 Exam 3 Practice Problems NOTE: These are just Practice Problems. This is NOT meant to look just like the test, and it is NOT the only thing that you should study. Make sure you know all the material from the notes, quizzes, suggested homework and the corresponding chapters in the book. Questions 1 – 7 Former kicker for the Gator football team, Chris Hetland, was very good at making field goals in the 2005 season, but in the 2006 regular season had only made 3 out of 12. The following is the Logistic Regression Output to predict the probability of making a field goal (yes/no), based on how far the kick is (in yards) and the year (2005 or 2006). Logistic Regression Table Predictor Coef SE Coef Z P Constant 8312.97 3073.50 2.70 0.007 yards -0.173760 0.0901421 -1.93 0.054 year -4.14174 1.53141 -2.70 0.007 1. What kind of variables do we have here? a) a quantitative predictor and a quantitative response b) two quantitative predictors and a quantitative response c) a quantitative predictor and a categorical response d) two quantitative predictors and a categorical response 2. Write down the fitted logistic regression equation: a) y ˆ = 8312.97 – 0.173760 – 4.14174 b) y ˆ = 8312.97 – 0.173760 yards – 4.14174 year c) p ˆ = e 8312.97 – 0.173760 – 4.14174 / 1+ e 8312.97 – 0.173760 – 4.14174 d) p ˆ = e 8312.97 – 0.173760 yards – 4.14174 year / 1+ e 8312.97 – 0.173760 yards – 4.14174 year 3. The coefficients of yards and years are both negative. This means: a) that neither variable is a good predictor of whether the kicker will make or not the field goal b) that simple linear regression would have been more appropriate than logistic regression c) that there was a mistake in the way the data was entered into the computer d) that the chances of making the field goal go down as the yardage increases, and as the years increase Find the probability of making a field goal: 4. from the 30 yd line in 2006 5. from the 30 yd line in 2005 6. from the 40 yd line in 2006 7. from the 40 yd line in 2005
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Question 8 - 13 As part of a project for their Intro Stat course, two students compared two brands of chips, Frito Lays and Golden Flakes, to see which company gives you more for your money. Five bags of each brand (which, according to the label, each contained 35.4 grams) were measured with a very accurate scale. Use the Wilcoxon Rank-Sum test to see if there are any significant differences between the two brands in the amount of product they put in their bags. Frito Lays:
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This note was uploaded on 12/15/2011 for the course STA 3024 taught by Professor Ta during the Spring '08 term at University of Florida.

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PracticeExamFinal3024 - STA 3024 Exam 3 Practice Problems...

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