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Understanding Bar Graphs: Definition, Uses, and Features in AP Statistics

This guide provides an overview of bar graphs, a fundamental tool in statistics used to visually display frequencies and percentages. Bar graphs can be either vertical or horizontal, featuring uniformly spaced bars that represent data values effectively. The guide includes details on their construction, such as proper annotation and scale usage, and introduces the Pareto chart as a special type of bar graph. Also highlighted is a classroom activity where students surveyed their favorite foods to demonstrate how bar graphs can compare preferences visually.

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Understanding Bar Graphs: Definition, Uses, and Features in AP Statistics

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  1. AP STATISTICS BAR GRAPHS By: Dorian C. Hardin-Hebert Michel’le C. Simpson Kevinique M. Walker-Smith

  2. What is a bar graph? A graph in which horizontal or vertical bars represents data What is a bar graph used for?? It’s used to visually display frequencies or percentages and can be used to compare data.

  3. Vocab Cuzz Ta-Ta Changing Scale- Whenever you use a change in scale in a graphic, warn the viewer by using a squiggle On the changed axis. Sometimes, if a single bar is usually long, the bar length is compressed with a squiggle in the bar itself. Pareto Chart- is a bar graph in which the bar height represents frequency of an event. In addition, the bars are arranged from left to right according to decreasing height.

  4. Features of A Bar Graph • Bars can be vertical or horizontal. • Bars are of uniform width and uniformly spaced. • The lengths of the bars represent values of the variable being displayed, the frequency of occurrence, or the percentage of occurrence. The same measurement scale is used for the length of each bar. • The graph is well annotated with title,, labels for each bar, and vertical scale or actual value for the length of each bar.

  5. Favorite Foods-First Pick, Second Pick

  6. Source of Our Info • We conducted a quick and easy survey to gather information from our class of 13 students and 1 teacher. • We picked four popular food groups and asked each person to pick a first favorite pick and a second favorite pick. • Then, transferred the information to the format of a bar graph!!!

  7. Favorite Foods-First Pick, Second Pick

  8. Solve The Problem • How many more students prefer seafood and Chinese food as a first pick than a second pick. S+C=9 S+C=8 2 +7=9 6+2=8 9-8= 1 person

  9. Sources • Understandable Statistics by Houghton Mifflin. • AP Statistics 6th Block Class

  10. THE END

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