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1.5 Representing a Quantitative Variable with Graphs

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Dotplots and Stemplots

Dotplot — best for small datasets.

To make a dotplot: Draw a number line covering the data range. Place one dot above the number line for each data value. Stack dots vertically when values repeat.

Stemplot (also called a stem-and-leaf plot).

Example: Data: 21, 23, 25, 25, 28, 31, 34, 34, 37, 42
StemLeaf21 3 5 5 831 4 4 742\begin{array}{r|l} \text{Stem} & \text{Leaf} \\ \hline 2 & 1\ 3\ 5\ 5\ 8 \\ 3 & 1\ 4\ 4\ 7 \\ 4 & 2 \end{array}

A back-to-back stemplot places groups on opposite sides of the same stems.

In this unit

10 lessons

  1. 1.1Introducing Statistics: What Can We Learn from Data?Preview lesson
  2. 1.2The Language of Variation: VariablesPreview lesson
  3. 1.3Representing a Categorical Variable with TablesPreview lesson
  4. 1.4Representing a Categorical Variable with GraphsPreview lesson
  5. 1.5Representing a Quantitative Variable with GraphsThis lesson
  6. 1.6Describing the Distribution of a Quantitative VariablePreview lesson
  7. 1.7Summary Statistics for a Quantitative VariablePreview lesson
  8. 1.8Graphical Representations of Summary StatisticsPreview lesson
  9. 1.9Comparing Distributions of a Quantitative VariablePreview lesson
  10. 1.10The Normal DistributionPreview lesson

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