1. Graphing Why? Help us communicate information : Visual What is it telling your? Basic Types Line Bar Pie

2. Line Graphs Show specific values of date: given one variable the other can easily be determined Show trends of data clearly: visibly shows how one variable is affected by the increase or decrease Make predictions about results not recorded yet.

3. QUESTION ANSWER 1. What is the title of this line graph? Value of Sarah’s Car 2. What is the range of values on the horizontal scale? 3. What is the range of values on the vertical scale? 4. How many points are in the graph? 5. What was the highest value recorded? 6. What was the lowest value recorded? 7. Did the value of the car increase or decrease over time? 8. What would the value of her car be in 2008?

4. 1. What was the minimum wage in January, 1978? 2. When did the minimum wage reach $3.35? 3. Between what time periods was the largest increase in minimum wage? 4. Based on your observations of the graph, make a prediction about what the wage might be in the year 2000. 5. What about the scales used on the graph might make the data appear differently than how it really is

5. Bar Graphs Make Comparisons Clearly show trends in data: show how one variable is affected as the other rises or false. Given on variable, the value of the other can easily be determined. CANNOT PREDICT

6. ** Need to label axis!

7. Pie Charts: Circle Graphs They don't use a set of axes to plot points Pie charts are display percentages. Therefore, they are used to compare different parts of the same whole. The circle of a pie graph represents 100%. Each portion that takes up space within the circle stands for a part of that 100%. In this way, it is possible to see how something is divided among different groups

9. HOW? Independent Variable: variable controlled by the experimenter - X axis Dependent variable: changes with independent variable - Y axis Determine Scale: Best fits the range of each variable - Spread the graph to use most of the available space. Be sure to label axis and give your graph a title. Title needs to clearly tell what the graph is about.