# Chapter 4.docx - Chapter4statistics ChapterSummary I A B II...

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Chapter 4 statistics Chapter Summary I. A dot plot shows the range of values on the horizontal axis and the number of observations for  each value on the vertical axis. A. Dot plots report the details of each observation. B. They are useful for comparing two or more data sets. II. A stem-and-leaf display is an alternative to a histogram. A. The leading digit is the stem and the trailing digit the leaf. B. The advantages of a stem-and-leaf display over a histogram include: 1. The identity of each observation is not lost. 2. The digits themselves give a picture of the distribution. 3. The cumulative frequencies are also shown. III. Measures of location also describe the shape of a set of observations. A. Quartiles divide a set of observations into four equal parts. 1. Twenty-five percent of the observations are less than the first quartile, 50 percent are  less than the second quartile, and 75 percent are less than the third quartile.
• Summer '15
• 50 percent, 75 percent, 25 percent, five percent, A. Dot plots, A. Quartiles

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