tailieunhanh - Lecture Basic statistics for business & economics (8/e): Chapter 2 – Lind, Marchal, Wathen

Chapter 2 - Describing data: Frequency tables, frequency distributions, and graphic presentation. After completing this unit, you should be able to: Organize qualitative data into a frequency table, present a frequency table as a bar chart or a pie chart, organize quantitative data into a frequency distribution, present a frequency distribution for quantitative data using histograms, frequency polygons, and cumulative frequency polygons. | Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation Chapter 02 Copyright © 2013 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill/Irwin LEARNING OBJECTIVES LO 2-1 Make a frequency table for a set of data. LO 2-2 Organize data into a bar chart. LO 2-3 Present a set of data using a pie chart. LO 2-4 Create a frequency distribution for a data set. LO 2-5 Understand a relative frequency distribution. LO 2-6 Present data from a frequency distribution in a histogram or frequency polygon. LO 2-7 Construct and interpret a cumulative frequency distribution. 2- Frequency Table and Frequency Distribution Class interval: The class interval is obtained by subtracting the lower limit of a class from the lower limit of the next class. Class frequency: The number of observations in each class. Class midpoint: A point that divides a class into two equal parts. This is the average of the upper and lower class limits. FREQUENCY TABLE A grouping of qualitative data into mutually exclusive classes showing the number of observations in each class. FREQUENCY DISTRIBUTION A grouping of data into mutually exclusive classes showing the number of observations in each class. LO 2-1 Make a frequency table for a set of data. 2- Bar Charts BAR CHART A graph in which the classes are reported on the horizontal axis and the class frequencies on the vertical axis. The class frequencies are proportional to the heights of the bars. LO 2-2 Organize data into a bar chart. 2- Pie Charts PIE CHART A chart that shows the proportion or percent that each class represents of the total number of frequencies. LO2-3 Organize data into a pie chart. 2- EXAMPLE – Creating a Frequency Distribution Table Ms. Kathryn Ball of AutoUSA wants to develop tables, charts, and graphs to show the typical selling price on various dealer lots. The table on the right reports only the price of the 80 vehicles sold last month at Whitner Autoplex. | Describing Data: Frequency Tables, Frequency Distributions, and Graphic Presentation Chapter 02 Copyright © 2013 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill/Irwin LEARNING OBJECTIVES LO 2-1 Make a frequency table for a set of data. LO 2-2 Organize data into a bar chart. LO 2-3 Present a set of data using a pie chart. LO 2-4 Create a frequency distribution for a data set. LO 2-5 Understand a relative frequency distribution. LO 2-6 Present data from a frequency distribution in a histogram or frequency polygon. LO 2-7 Construct and interpret a cumulative frequency distribution. 2- Frequency Table and Frequency Distribution Class interval: The class interval is obtained by subtracting the lower limit of a class from the lower limit of the next class. Class frequency: The number of observations in each class. Class midpoint: A point that divides a class into two equal parts. This is the average of the upper and lower class limits. FREQUENCY TABLE A .