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Course: Statistics and probability > Unit 2
Lesson 1: Displaying quantitative data with graphs- Creating frequency tables
- Creating dot plots
- Reading dot plots & frequency tables
- Dot plots and frequency tables review
- Histograms
- Create histograms
- Read histograms
- Histograms review
- Stem-and-leaf plots
- Reading stem and leaf plots
- Reading stem and leaf plots
- Stem and leaf plots review
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Stem and leaf plots review
Stem and leaf plots
A stem and leaf plot displays numerical data by splitting each data point into a "leaf" (usually the last digit) and a "stem" (the leading digit or digits).
For example, the buyer for a chain of department stores counted the number of pairs of boots at each of the stores and made a stem and leaf plot for the data. Here is the dataset and the stem and leaf plot:
Dataset: , , , , , , , , ,
Stem and leaf plot:
Key:
Want to learn more about reading stem and leaf plots? Check out this video.
Creating a stem and leaf plot
Here's how to make a stem and leaf plot step by step. We'll use the same dataset as before. Here it is again:
Step 1: Split each data point into a stem and a leaf. The stem is everything before the final digit, and the leaf is the final digit. Write the stems in a vertical column and don't skip stems just because they don't have any data.
Our are the tens digits:
Step 2: Write each leaf next to its corresponding stem. The
Step 3: Give a key that explains what a stem and leaf represent.
Key:
Want to learn more about creating stem and leaf plots? Check out this video.
Example: Reading stem and leaf plots
A zookeeper published the following stem-and-leaf plot showing the number of bears at each major zoo in the country:
Key:
Want to practice more problems like this? Check out this exercise on reading stem and leaf plots.
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