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Data Management

Data Management. Graphing: Stem-and-Leaf Plots. What is a Stem-and-Leaf Plot?. A stem-and-leaf plot is like a chart It is a way to organize data in groups A stem-and-leaf plot helps to organize larger numbers into easy-to-read groups

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Data Management

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  1. Data Management Graphing: Stem-and-Leaf Plots

  2. What is a Stem-and-Leaf Plot? • A stem-and-leaf plot is like a chart • It is a way to organize data in groups • A stem-and-leaf plot helps to organize larger numbers into easy-to-read groups • The stem (left side of the chart) shows the beginning of the number • The leaf (right side of the chart) shows the rest of the number

  3. What does information on a Stem-and-Leaf Plot look like? • Stem-and-leaf plots look like these (pictures taken from http://worksheets.tutorvista.com/math/87614/graphic-statistics.html ):

  4. Reading Stem-and-Leaf Plots and Place Value • It is important to remember that the stem gives us our place value when we read numbers from a stem-and-leaf plot . We only ever use one number from the leaf at a time to add to the stem. • For example, if the numbers in the stem are 1 number long, our total numbers are in the 10s, 20s, 30s, etc. If the numbers in our stem are 2 numbers long, our total numbers are in the hundreds (100s, 200s, 300s, 400s, etc.)

  5. Practice with Stem-and-Leaf Plotting • Our number set is:167, 156, 125, 155, 160, 169, 168, 167, 155, 135, 137, 144, 146, 125, 123, 156, 169, 125 • First we want to group the numbers from smallest to largest values, which would give us:123, 125, 125, 125, 135, 137, 144, 146, 155, 155, 156, 156, 160, 167, 167, 168, 169, 169 • Bonus: What is the mode of this set of numbers?

  6. Practice with Stem-and-Leaf Plotting (continued) • Then we want to group the numbers by their beginning digits:123, 125, 125, 135, 137, 144, 146, 155, 155, 156, 156, 160, 167, 167, 168, 169, 169 • Red means starts in 12 • Orange means starts in 13 • Yellow means starts in 14 • Green means starts in 15 • Blue means starts in 16

  7. Practice with Stem-and-Leaf Plotting (continued) • To complete the stem and leaf plot, simply draw a t-chart, write the first 2 numbers of each number in the stem section of the plot, then list the last numbers of each number in the leaf section of the plot (demonstrated on chalkboard)

  8. From the Math Textbook • For further practice with stem-and-leaf plots, complete number 1 and 2 on page 82 from the Nelson Mathematics 5 textbook.

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