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1-3 Graphical Summaries

1-3 Graphical Summaries - Lecture 1-3 Graphical Summaries...

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1 Lecture 1-3 Graphical Summaries Navidi Chapter 1.3
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2 Graphical Summaries Stem-and-leaf plot Dotplot Histogram Boxplot Scatterplot
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3 Stem-and-leaf Plot A simple way to summarize a data set. Each item in the sample is divided into two parts: a stem , consisting of the leftmost one or two digits, and the leaf , which consists of the next significant digit. It is a compact way to represent the data. It also gives us some indication of the shape of our data.
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4 Example: Duration of dormant periods of the geyser Old Faithful in Minutes Stem-and-leaf plot: 4 259 5 0111133556678 6 067789 7 01233455556666699 8 000012223344456668 9 013 Let’s look at the first line of the stem-and-leaf plot. This represents measurements of 42, 45, and 49 minutes. A good feature of these plots is that they display all the sample values. One can reconstruct the data in its entirety from a stem-and-leaf plot. Example 5
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5 Dotplot A dotplot is a graph that can be used to give a rough impression of the shape of a sample. It is useful when the sample size is not too large and when the sample contains some repeated values. Good method, along with the stem-and-leaf plot to informally examine a sample.
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