1. CO_02.jpg

2. 2.2 Graphs and Tables for Quantitative Data Objectives: By the end of this section, I will be able to… 3) Construct and interpret stem-and-leaf displays and dotplots.

3. Section 2.2 Part 2 Stem and Leaf Displays and Dotplots

4. 100657879929567718583 92866386757873869177 79809185766876889698 Stem-and-Leaf Plots: A quick way to organize pieces of data. Each data point is shown.

5. Rules for a Stem and Leaf 1) Put Data in Order FIRST 2) Choose your “stem” 3) Organize your leaves with the appropriate stem.

6. SORT DATA First thing we want to do is plug the data into our calculators (STAT – EDIT – LIST1) First thing we want to do is plug the data into our calculators (STAT – EDIT – LIST1) Then Sort your data (STAT – SORTA() – 2 nd 1 – ENTER) Then Sort your data (STAT – SORTA() – 2 nd 1 – ENTER)

7. 100657879929567718583 92866386757873869177928663867578738691779286638675787386917792866386757873869177 79809185766876889698798091857668768896987980918576687688969879809185766876889698 The “stems” will be the digits in the tens place. Place them vertically from smallest to largest. 6789 10 10 63 100

8. 100657879929567718583 92866386757873869177 79809185766876889698 Working left to right in the data set, places the “leaves” (the digits in the ones place) in the corresponding row in ORDER. 67 8 9 10 101 0 13 1 35 5 03 2 5 5 5 667 6 2 88 6 8 6 99 8 68 7

9. 100657879929567718583 92866386757873869177 79809185766876889698 63 5 7 8 71 3 5 6 6 7 8 8 9 9 80 3 5 5 6 6 6 8 91 1 2 2 5 6 8 100 100 Stems Leaves 7 1 means 71 71 KEY or LEGEND of the Stem and Leaf Plot

10. If the stem and leaf plot is turned sideways, a histogram is created. 99 88888888 868868868868 766766766766 665665665665 8652865286528652 7552755275527552 5331533153315331 31010310103101031010 6789 10 60s 80s 90s 100s 70s Intervals

11. How much money did you spend on shoes last year (estimate)? Make a stem and leaf plot displaying our results

12. 3.25.76.84.95.23.67.86.26.3 4.54.34.95.15.06.03.63.45.7 5.45.87.02.84.15.35.54.96.1 2 8 3 2 4 6 6 4 1 3 5 9 9 9 5 0 1 2 3 4 5 7 7 8 6 0 1 2 3 8 7 0 8 2 8 means 2.8

13. DOT PLOTS Simple graph to make Simple graph to make Shows relative positions of numbers Shows relative positions of numbers Allows for quick comparisons Allows for quick comparisons

14. How many siblings do you have? 01 2 3456

15. Dot Plot Example