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Graphing Notes Independent Variable- A variable whose value determines the value of other variables. Place on the X-axis. Dependent Variable- A mathematical variable whose value is determined by the independent variable. Place on the Y-axis Tables: Tables should always be drawn with the x-axis on the left side of the table Example: Age vs. Height The older you get the taller you grow. Age is the independent variable (X) and Height is the dependent variable (Y) Age (yrs.) 1 3 6 Height (in.) 22 35 50 Components of a good graph- all graphs drawn in Biology are worth 6 pts. 1. Title of the graph – 1 pt. 2. X-axis, drawn using a straight edge. 1 pt. 3. Y-axis, drawn using a straight edge. 4. Label on each axis with the units – 2 pts. 5. Values on the X-axis and Y-axis in even increments (evenly spaced). - 1 pt. 6. Independent Variable goes on the X-axis. 1 pt. 7. Dependent Variable goes on the Y-axis. Line of Best Fit- A line through data points that DOES NOT have to connect each point. The line shows the trend of the data as the Independent variable (X axis) increases Example of a line of best fit: