• Best Practices has the following caveats:

Question

• • Use a bar chart to show the frequencies of a categorical variable.
• • Use a pie chart to show the proportions of a categorical variable.
• • Preserve the ordering of an ordinal variable.
• • Respect the area principle. The relative size of a bar or slice should match the count of the associated category in the data relative to the
total number of cases.
• • Choose the best plots to answer the motivating question that you are studying.
• • Label your chart to show the categories and indicate whether some have been combined or omitted.
For the scenario below, suggest a plot of your own design to summarize the data. Support your conclusions.
Wireless phone company customers across the United States were surveyed and asked to rate the quality of service delivered by their wireless carrier. A publication of the consumer group summarizes the rating provided by each respondent as Excellent, Good, Fair, or Poor. What does it mean for a provider to get a modal rating of Excellent or a median rating of Excellent?
Choose a topic of your choice on which to collect data. Indicate the topic you have chosen, and describe how you would go about setting up and carrying through with your choice. What could you learn from this type of analysis? How meaningful is the range of a data set?