II. Descriptive Statistics A. Graphs and Tables for Univariate Data

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II. Descriptive Statistics A. Graphs and
Tables for Univariate Data
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• What type of data is presented in the graph?
• Is the graph based on frequencies or percents?

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• How many variables are included in the graph?
• What category has the largest frequency?

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• What type of data is presented in the graph?
• How many variables are presented in the graph?

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• Is the graph based on frequencies or percents?
• In the graph is there any meaning to the bars
  width?

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• Is there any meaning to the spacing between the
  bars?
• Does the order of the bars matter?

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• One Year Infant Mortality for Countries in
  Western Africa
• 84, 147, 88, 92, 113, 114, 124, 151
• 121, 122, 86, 138, 144, 51, , 148, 99
• Create a stem and leaf plot.
• Are there any extremes in the data set?

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• How is the histogram similar to a stem and leaf?
• How is the histogram different from a stem and
  leaf?

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Frequency Distribution Age Frequency 6 but lt
8 75 8 but lt 10 50 10 but lt 12 25 12 but lt
14 100

• Where does the histogram come from?
• What is the shape of the distribution?

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• What is the shape of the distribution?

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• What is the shape of the distribution?