1. Single and Multiple- Variable Data At the end of this lesson, you should be able to display & interpret single- and multiple-variable data.

2. EXAMPLE: Circle Graphs Circle graphs are useful when you want to _______________________________. This graph shows the favorite pastimes of a group of ninth graders. compare the parts to the whole 15% 20% 25% 10% 5%

3. EXAMPLE: Interpreting a Circle Graph 1.Which two activities were equally popular? 2.What percent of students chose reading or watching television? Solutions: 1.Playing sports and talking on the phone were equally popular. 2.35% of students chose reading or watching television.

4. EXAMPLE: Creating a Circle Graph All 400 Seneca Valley ninth graders voted for their class president. The results were: Starr Uno (160) Amy Brite (100), Phil R. Yupp (100), and Meg A. Byte (40). Create a circle graph to show and compare the election results.

5. SOLUTION: Class President Election Results Starr Uno 160 (40%)=.4 x 360 = 144 Amy Brite 100 (25%) =.25 x 360 = 90 Phil R. Yupp 100 (25%) =.25 x 360 = 90 Meg A. Byte 40 (10%) =.1 x 360 = 36

6. EXAMPLE: Double Bar Graphs Check: Which group volunteered twice as many volunteer hours as 11 th grade female students? 9 10 11 12 GRADE A double bar graph displays ________________________. two sets of related data VOLUNTEER HOURSVOLUNTEER HOURS

7. EXAMPLE: Double Line Graphs CLASS TREASURIES A double line graph shows ____________________________ _______________________________________________. changes over time for two sets of related data. MONEYINTENSOF$MONEYINTENSOF$

8. Final Check for Understanding Final Check for Understanding Mrs. McLachlan wants to create a graph showing how many pounds of paper were recycled by the 9 th, 20 th, 11 th, and 12 th grade classes. What would be the most appropriate display? Explain your reasoning.

9. HOMEWORK ASSIGNMENT