1. Statistics: Describing Quantitative Data
Stem and Leaf Plot Review

2. Do Now:
Complete the last problem in the histogram packet from yesterday. (The problem about PH Levels)
Pass your journals forward to the front two tables.

3. Histograms Any last questions regarding histograms? !?!?!?!?!!?
Regarding anything this week?

4. Stem/Leaf Plots Regular Split Stem and Leaf Back-To-Back Stem and Leaf
Three Types:
Regular
Split Stem and Leaf
Back-To-Back Stem and Leaf

5. Important Notes 1. You must have the same width for ALL stems
2. You must include ALL stems that are necessary, even if there are no leafs.

6. Example One:
Create a stem and leaf display for these horsepowers of autos reviewed by consumer reports one year, and describe the distribution.

7. Split Stem/Leaf Example
In June 2004, 16 gas stations in Ithaca, NY, posted these prices for a gallon of regular gasoline.
Create a stem and leaf display for the gas prices using split stems.

8. Back-To-Back Example
A consumer organization compared gas mileage figures for several models of cars made in the United States with auto manufactured in other countries. The data is shown below:
U.S Models: 16.9, 15.5, 19.2, 18.5, 30.0, 30.9, 20.6, 20.8, 18.6, 18.1, 17.0, 17.6, 16.5, 18.2, 26.5, 21.9, 27.4, 28.4, 28.8, 26.8, 33.5, 34.2
Others: 16.2, 20.3, 31.5, 30.5, 21.5, 31.9, 37.3, 27.5, 27.2, 34.1, 35.1, 29.5, 31.8, 22.0, 17.0, 21.6

9. Practice Examples Try some in small groups/on your own.
If you finish this packet– return to the histogram packet and finish the practice problems.

10. Exit Ticket Create a SPLIT stem and leaf plot for the following data:
10, 12, 11, 15, 18, 19, 20, 22, 21, 16, 18, 19, 23, 15, 6, 12