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Graphing Data

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OGT Benchmark SI-A Participate in and apply the processes of scientific investigation to create models and to design, conduct, evaluate and communicate the results of these investigations.

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OGT Indicator SI-5 Develop oral and written presentations using clear language, accurate data, appropriate graphs, tables, maps and available technology.

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OGT Indicator SI-6 Draw logical conclusions based on scientific knowledge and evidence from investigations.

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**1. Create a data table labeled with units.**

Graphing Notes 1. Create a data table labeled with units. Time (s) Distance (m) Red Car Blue Car

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**2. Decide what type of graph**

*Line (scatter) – shows changes over time, relationships or trends

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***Bar – compares different things**

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***Pie (circle) – shows parts or % of a whole thing**

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**3. For line graphs (and bars),. determine the range and scale**

3. For line graphs (and bars), determine the range and scale of your variables * range – lowest number to highest number Start at zero if it’s reasonable Example: range of 5 to 50 – start with zero Example: range of 2000 to 3000 – don’t start with zero – most of your graph will be empty space

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*** scale – labels for each line on the graph**

Must be evenly spaced, counting by a reasonable number – 2, 5, 10, 25, 100, etc For line graphs, number the lines, not the spaces Example: - each line is worth 2

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3. Label the horizontal axis with the independent variable and its unit – the independent variable is the one you set ahead of time

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Label the vertical axis with the dependent variable and its unit – the dependent variable is the one you are testing for Choose a title for your graph. Plot your data points.

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**8. The graph can then be used to predict unmeasured data points.**

Determine the trend in the data – draw a “best fit” line through your data points. 8. The graph can then be used to predict unmeasured data points. * interpolate points within your data range * extrapolate points beyond your data range

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Graphing Example Determine the relationship between the number of times a cricket chirps in a minute and the air temperature. Temperature in degrees F # of cricket chirps/min 90 3 80 6 70 11 60 15

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***Starting with zero, most of the graph is empty**

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*** With a “best fit” trend line**

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***Use the graph to interpolate the # of chirps at 75 degrees F.**

*Use the graph to extrapolate the # of chirps at 100 degrees F.

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Communicating with Graphs Notes 1.3. Objectives Identify three types of graphs and explain the ways they are used. Analyze data using the various types.

Communicating with Graphs Notes 1.3. Objectives Identify three types of graphs and explain the ways they are used. Analyze data using the various types.

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