8 *Pie (circle) – shows parts or % of a whole thing
9 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 numberStart at zero if it’s reasonableExample: range of 5 to 50 – start with zeroExample: range of 2000 to 3000 – don’t start with zero – most of your graph will be empty space
10 * scale – labels for each line on the graph Must be evenly spaced, counting by a reasonable number – 2, 5, 10, 25, 100, etcFor line graphs, number the lines, not the spacesExample: - each line is worth 2
11 3. Label the horizontal axis with the independent variable and its unit – the independent variable is the one you set ahead of time
12 Label the vertical axis with the dependent variable and its unit – the dependent variable is the one you are testing forChoose a title for your graph.Plot your data points.
13 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
14 Graphing ExampleDetermine the relationship between the number of times a cricket chirps in a minute and the air temperature.Temperature in degrees F# of cricket chirps/min90380670116015
15 *Starting with zero, most of the graph is empty