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Chapter_3_Study_Guide

# Chapter_3_Study_Guide - CHAPTER THREE DESCRIPTIVE...

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CHAPTER THREE DESCRIPTIVE STATISTICS: NUMERICAL METHODS In the following multiple choice questions, circle the correct answer. 1. A numerical value used as a summary measure for a sample, such as sample mean, is known as a a. population parameter b. sample parameter c. sample statistic d. population mean 2. μ is an example of a a. population parameter b. sample statistic c. population variance d. mode 3. The hourly wages of a sample of 130 system analysts are given below. mean = 60 range = 20 mode = 73 variance = 324 median = 74 The coefficient of variation equals a. 0.30% b. 30% c. 5.4% d. 54% 4. The median of a sample will always equal the a. mode b. mean c. 50th percentile d. all of the above answers are correct Exhibit 3-1 The following data show the number of hours worked by 200 statistics students. Number of Hours Frequency 0 - 9 40 10 - 19 50 20 - 29 70 30 - 39 40 5. Refer to Exhibit 3-1. The number of students working 19 hours or less a. is 40 b. is 50 c. is 90 d. cannot be determined without the original data 6. Refer to Exhibit 3-1. The cumulative relative frequency for the class of 10 - 19 a. is 90 b. is .25 c. is .45 1

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2 Chapter Three d. cannot be determined from the information given 7. The 75th percentile is referred to as the a. first quartile b. second quartile c. third quartile d. fourth quartile 8. The difference between the largest and the smallest data values is the a. variance b. interquartile range c. range d. coefficient of variation 9. In computing the hinges for data with an odd number of items, the median position is included a. only in the computation of the lower hinge b. only in the computation of the upper hinge c. both in the computation of the lower and upper hinges d. None of these alternatives is correct. 10. If a data set has an even number of observations, the median a. cannot be determined b. is the average value of the two middle items c. must be equal to the mean d. is the average value of the two middle items when all items are arranged in ascending order 11. The value which has half of the observations above it and half the observations below it is called the a. range b. median c. mean d. mode 12. The interquartile range is a. the 50th percentile b. another name for the variance c. the difference between the largest and smallest values d. the difference between the third quartile and the first quartile 13. The heights (in inches) of 25 individuals were recorded and the following statistics were calculated mean = 70 range = 20 mode = 73 variance = 784 median = 74 The coefficient of variation equals a. 11.2% b. 1120% c. 0.4% d. 40% 14 The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals a. 9 b. 4096 c. 8
Descriptive Statistics: Numerical Methods 3 d. 6561 Exhibit 3-2 A researcher has collected the following sample data 5 12 6 8 5 6 7 5 12 4 15. Refer to Exhibit 3-2. The mode is a. 5 b. 6 c. 7 d. 8 16. Refer to Exhibit 3-2. The 75th percentile is a. 5 b. 6 c. 7 d. 8

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Chapter_3_Study_Guide - CHAPTER THREE DESCRIPTIVE...

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