1. Data tables and Graphing A way to represent the data to make it easier to read and understand. Always organize the data in a table from greatest to least or least to greatest. Types of graphs: – Line – Bar – pie

2. Graphing Rules 1.Independent Variable must be on x axis. 2.Dependent Variable on y axis. 3.Label the axes, and include units for each! 4.Label the origin with zeros on both axis’. Not just one big “0”. 5.Don’t connect your line to the origin if it’s not indicated by the data. 6.Numbers on axes must be evenly spaced. Temperature (˚F) Number of breaths per min. 40 30 45 33 55 43 60 50 65 56 75 66

3. Spacing Calculate the spacing for each axis. – Range/#boxes for X axis – Range/# boxes for y axis – You may round up to an easy number.

4. example Assume 10 x10 grid For x (independent) – 75/10= 7.5 – Round up to 8 For y (dependent) - 66/10= 6.6 – Round up to 7

5. 5 When Graphing: Independent goes on the X-axis. Dependent goes on the Y-axis. Independent DependentDependent

6. 6 Practice: I changed the amount of fertilizer the plants got to see if they would grow more quickly with fertilizer. Amount of fertilizer Growth

7. 7 Practice: Which axis? I gave some people Tylenol to see if their headache would go away. No Tylenol Tylenol Pain Relief

8. 8 Practice: which axis? Bill tested the effects of amount of light on the greenness of his plants. Amount of light Green Color

9. 9 I covered Homing Pigeons’ ears to see if they could still find their way home. Covered Not Covered Number that came home

10. Make a line graph: Tom counted how many times his fish breathed at different temperatures. Here is his data table: Temperature (˚F)Number of breaths per min. 40 30 45 33 55 43 60 50 65 56 75 66

11. Temp (˚F) Number of breaths per min. 10 60 15 65 25 75 40 90 Temperature (˚F) Heart beats (per minute)