Lecture3[1]

# Lecture3[1] - Lecture 3 Stem and Leaf Plots Cross...

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Stem and Leaf Plots Cross Tabulations Sections 2.3 & 2.4 1 STAT 225, Dallas Bateman, Spring 2010 Lecture 3

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Stem and Leaf Plots Gives a quick picture of the shape of the distribution Shows the rank order and the distribution simultaneously Includes actual numerical values Works best for small numbers of observations where all observations are greater than zero 2 STAT 225, Dallas Bateman, Spring 2010
To Make a Stem and Leaf Plot: Number of Minutes Students Spent Surfing the Internet 7 20 24 25 25 28 28 30 32 35 42 43 44 45 46 47 48 48 50 51 72 75 77 78 79 83 87 88 90 91 3 STAT 225, Dallas Bateman, Spring 2010

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To Make a Stem and Leaf Plot: 1. Separate each observation into a stem consisting of all but the final (rightmost) digit and a leaf , the preceding digit(s). Stems may have as many digits as needed, but each leaf contains only a single digit. 0 1 2 3 4 5 6 7 8 9 4 STAT 225, Dallas Bateman, Spring 2010
To Make a Stem and Leaf Plot: 2. Write the stems in a vertical column with the smallest at the top, and draw a vertical line at the right of this column. 3. It may be convenient to sort the data before hand, but it can be done at the end. 0 7 1 2 0 4 5 5 8 8 3 0 2 5 4 2 3 4 5 6 7 8 8 5 0 1 6 7 2 5 7 8 9 8 3 7 8 9 0 1 5 STAT 225, Dallas Bateman, Spring 2010

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Stem and Leaf Notes If you wish to stretch out the data, you may do a “split stemplot” STAT 225, Dallas Bateman, Spring 2010 6
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Lecture3[1] - Lecture 3 Stem and Leaf Plots Cross...

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