TB Chapter 04 web

# TB Chapter 04 web - CHAPTER 4 NUMERICAL DESCRIPTIVE...

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CHAPTER 4 NUMERICAL DESCRIPTIVE TECHNIQUES SECTIONS 1 MULTIPLE CHOICE QUESTIONS In the following multiple-choice questions, please circle the correct answer. 3. Which measure of central location is meaningful when the data are nominal? a. The arithmetic mean b. The geometric mean c. The median d. The mode ANSWER: d 4. Which measure of central location is appropriate whenever we wish to find the average growth rate, or rate of change, in a variable over time? a. The arithmetic mean b. The geometric mean c. The median d. The mode ANSWER: b 9. Which measure of central tendency can be used for both numerical and categorical variables? a. The arithmetic mean b. The median c. The mode d. The geometric mean ANSWER: c 10. Which of the mean, median, mode, and geometric mean are resistant measures of central tendency? a. The mean and median only

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b. The median and mode only c. The mode and geometric mean only d. The mean and mode only ANSWER: b 11. In a positively-skewed distribution, a. the median equals the mean b. the median is less than the mean c. the median is larger than the mean d. the mean, median, and mode are equal ANSWER: b
TRUE / FALSE QUESTIONS 23. Two classifications of statistical descriptions are measures of central location and measures of variability. ANSWER: T 24. The mean is one of the most frequently used measures of variability. ANSWER: F 27. A student scores 87, 73, 92, and 86 on four exams during the semester and 95 on the final exam. If the final is weighted double and the four others weighted equally, the student's final average score would be 90. ANSWER: F 28. In a bell-shaped distribution, there is no difference in the values of the mean, median, and mode. ANSWER: T 35. In a histogram, the proportion of the total area which must be to the left of the median is less than 0.50 if the distribution is skewed to the left. ANSWER: F 40. A statistics professor bases his final grade on homework, two midterm examinations, and a final examination. The homework counts 10% toward the final grade, while each midterm examination counts 30%. The remaining portion consists of the final examination. If a student scored 95% in homework, 75% on the first midterm examination, 95% on the second midterm examination, and 80% on the final, his final average is 84.5%. ANSWER: T 41. The median of a data set with 30 items would be the average of the 15 th and the 16 th items in the ordered array. ANSWER: T

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FOR QUESTIONS 45 THROUGH 47, USE THE FOLLOWING NARRATIVE: Narrative: Monthly Rent Monthly rent data in dollars for a sample of 10 one-bedroom apartments in a small town in Iowa are as follows: 220, 216, 220, 205, 210, 240, 195, 235, 204, and 250. 45.
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## This note was uploaded on 11/22/2010 for the course ISDS 361A ISDS 361A taught by Professor Goldstein during the Spring '10 term at CSU Fullerton.

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TB Chapter 04 web - CHAPTER 4 NUMERICAL DESCRIPTIVE...

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