Exam 1 Practice test R

# Exam 1 Practice test R - Practice questions for Exam 1 This...

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Practice questions for Exam 1 This practice exam is not intended to duplicate the actual exam. It is intended to provide practice as part of your exam preparation. 1. The study of statistics encompasses all of the following except A. properly collecting of data. B. organizing and summarizing data. C. correctly obtaining anecdotal data. D. drawing inferences from sample data. 2. Which one of the following will change the appearance of a histogram? A. changing the width of the intervals B. changing the leaf unit C. changing the y axis from frequency to percentage D. changing from labeling the endpoints of the intervals to labeling the midpoints. 3. A company gives yearly performance ratings to each of its employees. These ratings are E for exemplary performance, A for acceptable performance and I for performance needing improvement. The 24 employees in the receiving department were given the following ratings: A A A E I E E A E A A I E A I A A E E A A I E E What type of graphical display should you use for this data? A. a histogram. B. a stem and leaf plot. C. a bar graph. D. a boxplot. 4. For the data in the previous question, what type of numerical summary (summaries) is (are) appropriate? A. Mean & standard deviation B. Five number summary C. Proportions or percentages D. Median and interquartile range 5. A professor wishes to graphically display the exam scores for 18 students in his class. The scores ranged from 45% to 100%. You should recommend that he use A. a histogram B. a stem and leaf plot C. a bar graph D. a pie chart. 6. Which one of the following variables is categorical (also called qualitative)? A. fuel efficiency of vehicles B. type of cell phone service C. number of phone calls made from hotel rooms D. body temperature

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7. Which one of the following variables is quantitative (also called numerical)? A. car color B. brand of detergent C. ID number of a BYU student D. weight of a football team member 8. Which of the following is NOT a measure of center of the data? A. interquartile range B. median C. mean 9. When the data are arranged in ascending numerical order, the median is the value which A. cuts the data in half. B. "balances" the data. C. occurs the most frequently. D. gives an appropriate measure of the spread of the data. 10. The five number summary consists of the following five numbers: A. minimum, Q 1 , mean, Q 3 , maximum. B. minimum, Q 1 , median, Q 3 , maximum C. minimum, x – 2s , mean, x + 2s, maximum D. x – 2s , x – s , x , x + s, x + 2s 11. The standard Normal table can be used to find approximate percentages for any distribution that A. has a quantitative variable. B. has only one peak. C. has the mean equal to the median. D.
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## This note was uploaded on 02/12/2010 for the course STAT 221 taught by Professor Collings during the Winter '08 term at BYU.

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Exam 1 Practice test R - Practice questions for Exam 1 This...

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