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GRAPHING NOTES

Learn the purpose, parts, types, and how to read and construct graphs. Comparing variables, plotting values, tracking data, and identifying trends.

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GRAPHING NOTES

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  1. GRAPHING NOTES Understanding and constructing graphs

  2. Purpose of a Graph • Compares how one variable changes with respect to another variable • May indicate a cause and effect relationship

  3. Parts of a Graph • Title: describes information a graph contains • Source: where information came from • Scale: value of one “box” on graph, number of units • Units: measurement in which data was recorded (inches, mm)

  4. Parts of a graph • Legend: explanation of symbols used, also called a key • X-axis: horizontal reference line, usually independent variable • Y-axis: vertical reference line, usually dependent variable

  5. Types of graphs • Line graph: one quantitly depends on changes in another. Values of numbers are plotted and connected with a line. May be used to predict future quantities

  6. Typical line graph

  7. Graph with multiple lines

  8. Types of Graphs • Bar Graph: Bars represent quantities. Used to compare related data side by side or track multiple categories • Pie or circle graph: Shows portions of a whole, based on 100%

  9. Typical Bar Graph

  10. Typical Pie Graph

  11. How to read or construct a graph • Title • Label and determine scale of axes • Determine units • Look at trends, patterns and relationships in the data represented

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