# Notes - WEEK 3 Notes The frequency distribution puts the...

• Notes
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WEEK 3 Notes The frequency distribution puts the data into a form that provides a bit more information than the original table provided. Using the frequency distribution, for example, we know that 40% of the colleges charge tuition rates between \$4,000 and \$6,000. This kind of insight is certainly not apparent when we scan the original table.

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Stem-and-leaf plot - Such a plot is sort of like a histogram turned on its side. The key to constructing a stem-and-leaf display is the selection of the stem units. In the graph below, I have let the stem value be thousands and the leaves be hundreds. So, the value that is circled represents a tuition value of \$8.8 thousand or \$8800. Box-plot - Sometimes called a box-and-whisker plot. This plot relies on the 5 number summary, which consists of the minimum value in the data set; the value of the first quartile—called Q1; the median, which is the middle ordered value or Q2; the value of the third quartile—called Q3; and the maximum value. Knowing these 5 numbers tells one a great deal about the data set under consideration and provides the building blocks for the box-plot. Additionally, knowing these values allows us to identify any outliers in our data set.
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• Spring '10
• dc

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