Chapter 2 - Descriptive statistics: Tabular and graphical methods. After mastering the material in this chapter, you will be able to: Summarize qualitative data by using frequency distributions, bar charts, and pie charts; construct and interpret Pareto charts (Optional); summarize quantitative data by using frequency distributions, histograms, frequency polygons, and ogives;. | Chapter 2 Descriptive Statistics: Tabular and Graphical Methods Copyright © 2014 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill/Irwin Descriptive Statistics Graphically Summarizing Qualitative Data Graphically Summarizing Quantitative Data Dot Plots Stem-and-Leaf Displays Crosstabulation Tables (Optional) Scatter Plots (Optional) Misleading Graphs and Charts (Optional) 2- Graphically Summarizing Qualitative Data With qualitative data, names identify the different categories This data can be summarized using a frequency distribution Frequency distribution: A table that summarizes the number of items in each of several non-overlapping classes LO2-1: Summarize qualitative data by using frequency distributions, bar charts, and pie charts. 2- Bar Charts and Pie Charts Bar chart: A vertical or horizontal rectangle represents the frequency for each category Height can be frequency, relative frequency, or percent . | Chapter 2 Descriptive Statistics: Tabular and Graphical Methods Copyright © 2014 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill/Irwin Descriptive Statistics Graphically Summarizing Qualitative Data Graphically Summarizing Quantitative Data Dot Plots Stem-and-Leaf Displays Crosstabulation Tables (Optional) Scatter Plots (Optional) Misleading Graphs and Charts (Optional) 2- Graphically Summarizing Qualitative Data With qualitative data, names identify the different categories This data can be summarized using a frequency distribution Frequency distribution: A table that summarizes the number of items in each of several non-overlapping classes LO2-1: Summarize qualitative data by using frequency distributions, bar charts, and pie charts. 2- Bar Charts and Pie Charts Bar chart: A vertical or horizontal rectangle represents the frequency for each category Height can be frequency, relative frequency, or percent frequency Pie chart: A circle divided into slices where the size of each slice represents its relative frequency or percent frequency LO2-1 2- Pareto Chart Pareto chart: A bar chart having the different kinds of defects listed on the horizontal scale Bar height represents the frequency of occurrence Bars are arranged in decreasing height from left to right Sometimes augmented by plotting a cumulative percentage point for each bar LO2-2: Construct and interpret Pareto charts (Optional). 2- Graphically Summarizing Qualitative Data Often need to summarize and describe the shape of the distribution One way is to group the measurements into classes of a frequency distribution After grouping them, we can display the data in the form of a histogram LO2-3 Summarize quantitative data by using frequency distributions, histograms, frequency polygons, and ogives. 2- Frequency Distribution A frequency distribution is a list of data classes with the count of values that belong .
