1. Displaying Quantitative Data Dot Plots Time Plots Stem and Leaf Plots Histograms Box Plots Remember to always describe these graphs using CUSS after you have graphed your data.

2. Dot Plots Most Useful - Small number of values - Want to see individual values - Want to see the shape of the distribution - You have a small number of groups you want to compare Let’s make a dot plot for the number of movies we saw this summer.

3. Time Plots - Type of dot plot - Plot data in order according to time Example: page 57.

5. Stem and Leaf Plots Most Useful - Relatively Small number of values - Want to see the shape of the distribution - You have two or more groups to compare Sometimes just called a stem plot stemleaf You always need a key with stem plot.

6. Example: page 67 #17

7. Suppose the grades on a test were 95 90 87 88 65 73 72 53 97 95 73 96 78 75 60 89 81 82 84 78 76 68 Make a stem plot 9876598765 Make a stem plot with split stems 9H 9L 8H 8L 7H 7L 6H 6L 5H 5L

8. Back – to – back stem plots Used to compare data Page 70 # 35

9. Histograms Most Useful - large number of values - You don’t need to see individual values - Want to see the shape of the distribution - You have a small number of groups you want to compare Draw backs - Individuals working with the same data could get different graphs We will use our calculator to create histograms, we will not create by hand

10. Example 1: Number of pieces of mail received at a school office for 36 days 123709080787252103138 112 92931181181069513159 151 115971001281306613576 14310088110756011510585

11. Example 2: The Degree of Reading Power (DRP) scores for 44 third grade students 40263914421825434627 19471926 353415444038 3146522535353329 3441 49285247354822334151 2714 5445 First let us divide the data into classes and make a frequency chart classfrequency 10-19 20-29 30-39 40-49 50-59 In L1 enter the smallest number of the class (10, 20, etc) In L2 enter the frequency You will need the change the window for your graph: Xmin=10, Xmax=60, Xscl = 10

12. Example 3: page 66: #15