Practice%20Exam%201

Practice%20Exam%201 - Practice Exam 1 STAT 1100, Fall 2007...

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Practice Exam 1 Name_______________________________ STAT 1100, Fall 2007 Instructor: Juan Carlos Rodríguez-Raga This is a closed-book exam. You are allowed to use a calculator and one two-sided sheet of notes. There are 23 problems, with point values as shown. Parts of problems do not necessarily receive equal weight. If you want to receive partial credit for incorrect answers, show your work. Don’t spend too much time on any one problem. When necessary, round your final answer to four decimals. (5) 1. A marketing executive wishes to determine the effectiveness of advertising on consumer demand. The independent (or explanatory) variable in this study is a. the amount spent on advertising. b. the number of businesses in the study. c. consumer demand. d. the stimulus. (5) 2. Chebysheff’s Theorem states that the percentage of measurements in a data set that fall within two standard deviations of their mean is a. 75%. b. at least 75%. c. 89%. d. at least 89%. (5) 3. You want to draw a graphical display showing the number of individuals in each category of a nominal variable. You should construct a a. bar chart. b. scatterplot. c. histogram. d. stem-and-leaf display. (5) 4. You want to graphically depict the relative frequency of classes of a set of interval data and also (simultaneously) display the values of the individual observations. You should construct a a. bar chart. b. scatterplot. c. histogram. d. stem-and-leaf display.
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2 (5) 5. When collecting data from the class, I asked each student to provide the number of siblings in his or her family. The data collected were a. nominal (but not ordinal) data. b. ordinal data. c. interval data. d. bivariate data. Use the following information to answer questions 6 and 7: The Office of Research at University X wants to know what the university faculty think about course evaluations by students. To find out, they distribute a questionnaire, on a randomly selected day, to the 60 faculty members who are eating lunch at the Faculty Club. (70% of the faculty belong to the Faculty
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This note was uploaded on 04/07/2008 for the course STATS 1100 taught by Professor Rodriguez during the Spring '08 term at Pittsburgh.

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Practice%20Exam%201 - Practice Exam 1 STAT 1100, Fall 2007...

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