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Section 2.1, Frequency Distributions and Their Graphs

Section , Frequency Distributions and Their GraphsThe main characteristics we will use to describe a data set are its center, its variability, and itsshape. One way to see patterns in data is to make a graph . In this Section , we will look at 3 waysto graphically summarize data: Frequency Distributions , Frequency histograms, and a cumulativefrequency Frequency distributionAfrequency distributionis a table that shows classes or intervals of data entries with a countof the number of entries in each class. Thefrequencyfof a class is the number of data entries inthe class. Each class will have a lower class limit and an upper class limit which are the lowestand highest numbers in each class. The class width is the distance between the lower limits ofconsecutive classes. Therangeis the difference between the maximum and minimum data for constructing a Frequency distribution from a data set1.

Section 2.1, Frequency Distributions and Their Graphs The main characteristics we will use to describe a data set are its center, its variability, and its shape. One way to see patterns in data is to make a graph. In this section, we will look at 3 ways to graphically summarize data: frequency distributions, frequency histograms, and a cumulative

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