Data tables and Graphing A way to represent

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

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

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.

example • Assume 10 x 10 grid • For x (independent) – 75/10= 7. 5 – Round up to 8 • For y (dependent) -66/10= 6. 6 – Round up to 7

When Graphing: • Independent goes on the X-axis. • Dependent goes on the Y-axis. D e p e n d e n t Independent 5

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

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

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

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

Practice 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

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