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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 2Stem and Leaf Displays and Dotplots

4. 100 65 78 79 92 95 67 71 85 83 92 86 63 86 75 78 73 86 91 77 79 80 91 85 76 68 76 88 96 98 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) • Then Sort your data (STAT – SORTA() – 2nd 1 – ENTER)

7. 100 63 100 65 78 79 92 95 67 71 85 83 92 86 63 86 75 78 73 86 91 77 79 80 91 85 76 68 76 8896 98 The “stems” will be the digits in the tens place. Place them vertically from smallest to largest. 6 7 8 9 10

8. 100 65 78 79 92 95 67 71 85 83 92 86 63 86 75 78 73 86 91 77 79 80 91 85 76 68 76 88 96 98 Working left to right in the data set, places the “leaves” (the digits in the ones place) in the corresponding row in ORDER. 6 7 8 9 10 3 5 7 8 1 3 5 6 6 7 8 8 9 9 0 3 5 5 6 6 6 8 1 1 2 2 5 6 8 0

9. 100 65 78 79 92 95 67 71 85 83 92 86 63 86 75 78 73 86 91 77 79 80 91 85 76 68 76 88 96 98 6 3 5 7 8 7 1 3 5 6 6 7 8 8 9 9 8 0 3 5 5 6 6 6 8 9 1 1 2 2 5 6 8 10 0 71means 71 Stems 7 1 KEY or LEGEND of the Stem and Leaf Plot Leaves

10. 70s If the stem and leaf plot is turned sideways, a histogram is created. 9 9 8 8 8 6 8 7 6 6 6 6 5 8 6 5 2 7 5 5 2 5 3 3 1 3 1 0 1 0 6 7 8 9 10 80s 90s Intervals 60s 100s

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

12. 3.2 5.7 6.8 4.9 5.2 3.6 7.8 6.2 6.3 4.5 4.3 4.9 5.1 5.0 6.0 3.6 3.4 5.7 5.4 5.8 7.0 2.8 4.1 5.3 5.5 4.9 6.1 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 • Shows relative positions of numbers • Allows for quick comparisons

14. How many siblings do you have? 2 0 1 3 4 5 6

15. Dot Plot Example