Stem and Leaf Plot

STEM AND LEAF PLOT ASSIGNMENT HELP

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Stem and Leaf Plot

Definition:
The technique used to show both the rank order and the shape of a data set simultaneously.

To illustrate the use of stem and leaf display consider the data in given table

70 72 75 64 58 83 80 82
76 75 68 65 57 78 85 72


To develop stem and leaf display, first arrange the leading digits of each data value to the left of vertical line. To the right of vertical line, record the last digit for each data value

5 | 7 8
6 | 5 4 8
7 | 0 2 5 2 5 6 8
8 | 0 2 5 3


With this organization of the data, sorting the digits on each line into rank order is simple. Doing so provide the stem-and-leaf display shown below.

5 | 7 8
6 | 4 5 8
7 | 0 2 2 5 5 6 8
8 | 0 2 3 5


The numbers to the left of the vertical line (5,6,7,8) form the stem, and each digit to the right of vertical line is a leaf .Rotating the page counter clockwise onto its sides provides a picture of the data that is similar to a histogram with classes of 50-59,60-69,70-79,and so on.

In spite of the fact that stem and leaf display may appear to offer same information as a histogram, it has two primary advantages.
1. The stem and leaf display is very simple and can be made by hand.
2. In the given range, the stem and leaf display deliver more detailing than a histogram because the stem and leaf presents the actual data.

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