Graphing Notes Graphs – diagrams telling how two variables or factors are related Graphs – diagrams telling how two variables or factors are related Show how change in one variable equals change in a second variable Show how change in one variable equals change in a second variable Can be used to make predictions Can be used to make predictions 3 types of Graphs 3 types of Graphs

Circle or Pie Graph Shows a % of a whole quantity Shows a % of a whole quantity Example:

Bar Graph Comparing information or data collected by counting Comparing information or data collected by counting

One Independent and One Dependent Variable Simple bar graph

Line Graph Most accurate for science Most accurate for science Show relationship of two variables (independent vs. dependent) Show relationship of two variables (independent vs. dependent) Can show more than one event (experiment) Can show more than one event (experiment)

Figure 1. Labour force participation in Andrew's high school

A multiple line graph can effectively compare similar items over the same period of time (Figure 5). Figure 5. Cell phone use in Anytowne, 1996 to 2002

Building Line Graphs 1. Data Table – check units of all measurements! Ind. Dep.

2. Label Parts of Graph X axis = indep. Variable X axis = indep. Variable Y axis = dep. Variable Y axis = dep. Variable Include unit labels for axis Include unit labels for axis Title Title Y axis X axisx

3. Measurements on proper axis – make sure of proper and equal spacing 4. Plot points of given data 5. Connect dots