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Understanding Graphs: Bar Graphs, Histograms, and Misleading Visuals

This guide explores the fundamental differences between bar graphs and histograms, including how to determine class width and the representation of data through line graphs. It dives into stem-and-leaf plots with example data points, demonstrating practical applications. Furthermore, it addresses the five common methods people use to mislead viewers with graphs: truncated graphs, scaling, readability issues, misuse of data percentages, and misleading images. Clear examples and exercises are provided to understand regular vs. misleading graphs.

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Understanding Graphs: Bar Graphs, Histograms, and Misleading Visuals

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Presentation Transcript

  1. WARM UP • What is the difference between a bar graph and a histogram? • How do you find the class width? • A line graph represents what? • Make a stem and leaf plot of the following data points. 468 548 632 842 745 567 821 598 435 387 830 926

  2. Section 2.5 Misleading Graphs There are FIVE ways we will look at that people try to mislead you with their graphs.

  3. 1) TRUNCATED GRAPHS

  4. Ways to Mislead

  5. Truncated • The vertical scales of graphs are altered to distort information.

  6. What is wrong with this graph?

  7. Are they the same? • The graphs below show the number of people who rode buses from September through February.

  8. 2) SCALING

  9. Ways to Mislead

  10. SCALING • The size of a graph or a figure is altered to distort information.

  11. TOO MUCH INFORMATION 3) HARD TO READ

  12. What is wrong with this graph?

  13. 4) Misuse of data or percentages

  14. 5) Misuse of pictures

  15. CREATE TWO GRAPHS • One regular graph • One misleading graph • Label both graphs clearly!

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