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# How to Create Bar and Line Graphs

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### Transcript

• 1. How to Create Bar and Line Graphs
• 2. Draw the Axes
• 3. Identify the Axes Y- Axis X- Axis
• 4. Identify the Axes Y- Axis X- Axis Dependent Variable (what is observed and measured) Independent Variable (what is changed by the scientist)
• 5.
• One way to remember which data goes on which axis is the acronym DRY MIX .
• D.R.Y. M.I.X .
• D - Dependent M - Manipulated
• R - Responding I - Independent
• Y - Y-axis X - X-axis
DRY MIX
• 6.
• Write an appropriate title for the graph at the top.
• The title should contain both the independent and dependent variables.
Title
• 7.
• Decide on an appropriate scale for each axis.
• The scale refers to the min and max numbers used on each axis. They may or may not begin at zero.
• The min and max numbers used for the scale should be a little lower than the lowest value and a little higher than the highest value.
• This allows you to have a smaller range which emphasizes the comparisons/trends in the data.
Scale
• 8. Scale
• The Y-axis scale is from 0-100.
• The largest value though is only 35.
• 9. Scale
• The Y-axis scale is now from 0-40.
• This does a better job emphasizing the comparisons between coins.
• 10.
• Look at your minimum and maximum values you set up for both the Y and X-axis. (For most bar graphs, the X-axis will not have numerical values.)
• Decide on an appropriate interval for the scale you have chosen. The interval is the amount between one value and the next.
• It is highly recommended to use a common number for an interval such as 2, 5, 10, 25, 100, etc.
Intervals
• 11. Intervals The interval for the Y-axis is 20. The X-axis does not have numerical data and does not need an interval.
• 12.
• Both axes need to be labeled so the reader knows exactly what the independent and dependent variables are.
• The dependent variable must be specific and include the units used to measure the data (such as “number of drops”).
Labels
• 13. Labels DV label IV label
• 14.
• T.A.I.L.S.
• T itle
• A xis
• I nterval
• L abels
• S cale
TAILS
• 15. TAILS Title: Includes both variables Axis: IV on X-axis and DV on Y-axis Interval: The interval (4) is appropriate for this scale. Label : Both axes are labeled. Scale: Min and max values are appropriate.
• 16. Bar Graphs vs Line Graphs
• 17. Bar Graphs
• Bar graphs are descriptive.
• They compare groups of data such as amounts and categories.
• They help us make generalizations and see differences in the data.
• 18. Example
• 19. Another example
• 20. Line Graphs
• Line graphs show a relationship between the two variables. They show how/if the IV affects the DV.
• Many times, the IV plotted on the X-axis is time.
• They are useful for showing trends in data and for making predictions.
• 21. Example
• 22. Another example
• 23. Create-a-Graph Online!