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# Bar Graphs

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### Transcript of "Bar Graphs"

1. 1. Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S Using Bar Graphs to Represent Data
2. 2. Discussion Questions: Assume that you are the Chief of Police for the town of Columbia. When you were hired in 1993, you made a commitment to make sure crime did not “get out of control.” The town council has asked you to report on crime trends over the past five years. Which graph would you choose to use in your presentation? Why did you choose this one? Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S
3. 3. Bar Graphs Data can be displayed in a number of different ways. One could make a chart, circle graph, line plot, or perhaps a bar graph. In this section we will look at how data can be represented using a bar graph. Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S
4. 4. Biased vs Unbiased Bar Graphs Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S A bar graph can be constructed in a such a way as to manipulate the data. A bar graph can be created to exaggerate the difference among data or it can minimize the differences in data. These manipulations could include:  Changing the horizontal scale  Changing the vertical scale  Changing the starting point of the scale.
5. 5. Manipulating Data Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S The incidence of various types of crimes for the town of Columbia are shown below. Year 1997 1998 1999 2000 2001 # of Crimes 1109 1200 1287 1350 1443 Normal Graph Minimized Graph Exaggerated Graph
6. 6. Normal Graph Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S
7. 7. Minimized Graph Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S
8. 8. Exaggerated Graph Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S
9. 9. Discussion Questions: Assume that you are the Chief of Police for the town of Columbia. When you were hired in 1993, you made a commitment to make sure crime did not “get out of control.” The town council has asked you to report on crime trends over the past five years. Which graph would you choose to use in your presentation? Why did you choose this one? Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S
10. 10. Review Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S • To Minimize difference you must make your scale on the y-axis larger. • To maximize differences you must make your scale on the y-axis smaller. • Another way to maximize the difference is to start your vertical scale at a number above zero.
11. 11. Unit 2 – Data Analysis & Interpretation Consumer Mathematics 30S Textbook Assignment: Page 110 - 111 Questions 1 - 3