EXS_EX.1.2009.Spring

EXS_EX.1.2009.Spring - SOLUTIONS MAT 167: Statistics Test...

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Unformatted text preview: SOLUTIONS MAT 167: Statistics Test I: Chapters 1-4 Instructor: Anthony Tanbakuchi Spring 2008 Name: Computer / Seat Number: No books, notes, or friends. Show your work. You may use the attached equation sheet, R, and a calculator. No other materials. Write your work in the provided space for each problem (including any R work if appropriate). You may not use personal computers, only use the classroom computer at your desk. Using any other program or having any other documents open on the computer will constitute cheating. You have until the end of class to finish the exam, manage your time wisely. If something is unclear quietly come up and ask me. If the question is legitimate I will inform the whole class. Express all final answers to 3 significant digits. Probabilities should be given as a decimal number unless a percent is requested. Circle final answers, ambiguous or multiple answers will not be accepted. Show steps where appropriate. The exam consists of 10 questions for a total of 46 points on 10 pages. This Exam is being given under the guidelines of our institution’s Code of Academic Ethics . You are expected to respect those guidelines. Points Earned: out of 46 total points Exam Score: MAT 167: Statistics, Test I: Chapters 1-4 SOLUTIONS p. 1 of 10 Solution: Exam Results. Below are the summary statistics. > summary( score ) Min . 1 st Qu. Median Mean 3rd Qu. Max. 20.00 60.00 75.56 71.53 87.78 100.00 > par (mfrow = c (1 , 2)) > boxplot ( score , main = ”Boxplot of exam scores ”) > hist ( score , main = ”Histogram of exam scores ”) 20 40 60 80 100 Boxplot of exam scores Histogram of exam scores score Frequency 20 40 60 80 100 1 2 3 4 5 1. Provide short succinct written answers to the following conceptual questions. (a) (1 point) Would mass in grams be classified as a nominal, ordinal, interval, or ratio level of measurement? Solution: Mass is a ratio level of measurement since 0 mass means there is no mass at all. (b) (1 point) Which of the following measures of variation is most effected by outliers: IQR, standard deviation, range Solution: The range is most effected by outliers (c) (1 point) What percent of data is greater than Q 3 ? Solution: 25% (d) (1 point) If the mean, median, and mode for a data set are all the same, what can you conclude about the data’s distribution? Instructor: Anthony Tanbakuchi Points earned: / 4 points MAT 167: Statistics, Test I: Chapters 1-4 SOLUTIONS p. 2 of 10 Solution: If all three measures of center are the same, the distribution is symmetrical. (Not necessarily a normal distribution, all we know is that it is symmetrical.) (e) (1 point) If the median is greater than the mode for a data set, what can you conclude about the data’s distribution?...
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This note was uploaded on 02/10/2012 for the course MAT 1670 taught by Professor Tanbakuchi during the Spring '11 term at University of Florida.

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EXS_EX.1.2009.Spring - SOLUTIONS MAT 167: Statistics Test...

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