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A stem and leaf plot is like a sideways column graph that lists but one that lists the actual scores on the horizontal columns. An ordered stem and leaf plot shows:
all the scores, listed smallest to largest
any modes (common scores)
any clusters or outliers
how the scores are spread out
The stem and leaf plot splits up the numbers most commonly the stem is the 10s column and the leaves are the units, there should always be a key to show how the stem and leaf should be read. For example 3|2 = 32.
To review finding statistics from a stem and leaf plot watch the video.
If you are confident have a go at the activity below.
Back to Back Stem and Leaf
Back to Back Stem and Leaf
Back to back stem and leaf plots are able to compare two sets of data easily. You can quickly see the spread and the distribution of the two data sets.
Back to back stem and leaf plots can be difficult to read as the left side is 'backwards'.
Stem and Leaf diagrams are also important for determining the skew or shape of the data. When looking at a graph we can see if it is positively skewed, negatively skewed or symmetrical.
Stem and Leaf diagrams are also important for determining the skew or shape of the data. When looking at a graph we can see if it is positively skewed, negatively skewed or symmetrical.
When looking at a stem and leaf we have to look at it sideways to determine its shape and skewness.
A lot if people get confused between positively and negatively skewed data, to remember it you want to think about the way the 'tail' of the data is pointing.
Practice interpreting back-to-back stem-and-leaf diagrams below.
Interdisciplinary Component
Interdisciplinary Component
Draw a back-to-back stem and leaf diagram to compare two different groups of athletes.
Consider what this tells you about the data, can you make a comparison that can help to inform your training plan?
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