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Graphing Skills

Graphing Skills. Lines, Bars and Pies. Types of Graphs. Line (a lot of data, often involving time) Used when there may be a trend or pattern Age versus Height Bar (counting) Used for somewhat unrelated items Number of Dog, Cats and Fish as pets Pie (if a total is involved)

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Graphing Skills

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  1. Graphing Skills Lines, Bars and Pies

  2. Types of Graphs • Line (a lot of data, often involving time) • Used when there may be a trend or pattern • Age versus Height • Bar (counting) • Used for somewhat unrelated items • Number of Dog, Cats and Fish as pets • Pie (if a total is involved) • Used to show how one thing is part of a whole thing • Percent of votes in an election • (Part/Whole) * 100%

  3. Bar Graph

  4. Independent Variable • What the scientist picks • What the scientist can control • Type of droppers, I could have used a turkey baster or snot sucker • Dependant Variable • The result of the independent variable • The number of drops DEPENDED of which dropper we used

  5. Scale • MUST be equal • EVERY line MUST mean something • 2, 4, 5, 1.2 Doesn’t matter as long as you keep it the same • Can be altered ONCE using a ‘break’ across the axis • The break is usually a diagonal equal sign or a heartbeat (see examples above) • ONLY used if there is a LARGE gap in ALL the data • To Find your scale Figure out how much data you have then, count the amount of space you have and divide: • Example: 39 drops of water was the most so go to 40 • I have 11 lines to fit it on my graph • 40 ÷ 11 = 3.64 If I go by 3.8 or 4 it will fit well

  6. Line Graphs follow the same basic rules as bar graphs. • Can have multiple lines. • Line doesn’t always have to start at zero.

  7. Pie Graphs • Data is shown as a percent of a whole. • To Calculate Percent • Find the part you want • Divide it by the total • Take that answer and multiply it by 100

  8. (part/whole) * 100 • Calculation Example: • 68 people voted • Marcia got 25 votes • Sam got 31 votes and • Ian got the rest

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