1. Stem and Leaf Plots By Mr. Chancellor

2. Stem and Leaf Plots • Stem and Leaf Plots show visually the distribution of data, while also showing the value of numbers

3. What is a Stem and Leaf Plot? • 4 1 2 3 5 • 5 2 4 6 • 6 1 2 4 • 7 3 4 8

4. Making a Stem and Leaf Plot Make the list into a Stem and Leaf Plot. 8,6,16,14,12,17,6,6,9,11,11,12,16,7,17,10 (This is the same list from my baseball pitcher!) 0 6 6 6 7 8 9 1 0 1 1 2 2 4 6 6 7 7

5. Finding the Range using Stem and Leaf Plots 0 6 6 6 7 8 9 1 0 1 1 2 2 4 6 6 7 7 17 – 6 = 11, therefore the range is 11 Range is the difference between the maximum value and minimum value. (Max value – Min. value)

6. How to find the Mean, Median, and Modehttp://www.youtube.com/watch?v=uydzT_WiRz4 • To find the Mean or average of numbers: 8,5,3,5,10,7,6,4 = 48/8 Mean is 6 • To find the Median (the value in the middle) of a number set: • 8,5,3,5,10,7,6,4 – Take the numbers and sort them! • 3,4,5,5,6,7,8,10 = We have two middle # (5+6/2=5.5) To find the Mode (or the number that shows up the most) 8,5,3,5,10,7,6,4=5

7. Box and Whisker PlotsDividing data into Quartiles Quartiles is another way of saying dividing the data into quarters of fourths. • First, find the median (the middle number) • Next, find the middle of the lower number, (not including the median), this is the first quartile Q1 • Lastly, find the middle of the greater value, (not including the median), this is the third quartile Q3

8. Find Q1 and Q3 for Box and Whisker Plot 6 6 6 7 8 9 10 11 11 12 12 14 16 16 17 17 6 6 6 7 8 9 10 11 11 12 12 14 16 16 17 17 Least Q1 Q2 Q3 Greatest First find the median (the middle number) = 11 (which is the Q2)

9. Creating Scatter Plots • The following numbers are saves in a year for another one of Mr. Chancellor’s favorite pitchers! We will find out: • How to plot data on a scatter plot • To see if there is a correlation 9 8 7 6 5 4 3 2 1 Saves Years 99 01 02 03 04 05 06 07 08