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Lesson 3: Basic Descriptive Statistics
10 The Stem and Leaf Plot < Back | Next >
The stem and leaf plot is similar to a histogram or bar chart with the exception that it allows a reader to get more precision when reading the results.
Example

Letís take a look at what stem and leaf plot looks like and go over how they are constructed. The data used to construct the stem and leaf plot is as follows:

21, 22, 22, 24, 31, 31, 31, 35, 37, 43, 44, 46, 48, 48, 49, 52, 55, 55, 56, 67, 68, 68

Stem Leaves
2 1224
3 14457
4 346889
5 2556
6 788
Multiply the stem by 10 and then add the leaf to the stem.

Letís look at this in a little more detail, the first sample point is equal to 21, therefore we enter a 2 under the stem side of the plot and a 1 under the leaves side. Your plot should now look like this.

Stem Leaves
2 1
3  
4  
5  
6  
Multiply the stem by 10 and then add the leaf to the stem.

Multiply the stem by 10 and then add the leaf to the stem to get the original value.

If we add the next data point (22) the plot will then look like this.

Stem Leaves
2 12
3  
4  
5  
6  
Multiply the stem by 10 and then add the leaf to the stem.

We continue this process for all the data points. We end up with the stem and leaf plot we had at the beginning which looks like this:

Stem Leaves
2 1224
3 14457
4 346889
5 2556
6 788
Multiply the stem by 10 and then add the leaf to the stem.

This is just a simple example of a stem and leaf plot, you can see that not only does this type of plot show the distribution of the data but it also allows us to know precisely what data was recorded.

LESSON 3
1 Overview
2 Intro to Descriptive Statistics
3 Calculating the Mean or Average
4 Calculating the Median
5 Calculating the Mode
6 Describing the Spread of Data
7 Calculating the Variance
8 Calculating the Standard Deviation
9 Graphical Representation of Data
10 The Stem and Leaf Plot
11 Review Questions
< Back | Next >

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