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Chapter 2.2

Chapter 2.2. Histograms. Graphs. The purpose of graphs in statistics is to convey the data to the viewers in pictorial form. They are used to describe the data set or to analyze it.

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Chapter 2.2

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  1. Chapter 2.2 Histograms

  2. Graphs • The purpose of graphs in statistics is to convey the data to the viewers in pictorial form. They are used to describe the data set or to analyze it. • The three most commonly used graphs in research are the histogram, the frequency polygon, and the ogive (aka cumulative frequency graph)

  3. Histogram • The histogram is a graph that displays the data by using contiguous vertical bars (unless the frequency is 0) of various heights to represent the frequencies of the classes.

  4. Example 1: Frequency Table for High Temperatures of each state:

  5. Steps for making a Histogram • Draw and label the x and y axes • Represent the frequency on the y-axis and the class boundaries on the x-axis. • Use the frequencies as heights, draw vertical bars for each class

  6. Histogram for High Temperatures in Each State

  7. Example 2: MPG of SUVs

  8. Histogram for MPG of SUVs

  9. Texting Survey! • Please keep the survey anonymous

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