1. Warm Up Write your height in centimeters on the board. Females on one side, Males on the other. Draw a stem plot for height and then two stem plots of height by gender. Describe the graphs as well as you can. Compare your solutions from the homework

2. Warm Up 1. Gather data from 15 people in class regarding the ages of each of their siblings. 2. Record the distribution of their ages in a dot plot. 3. Describe the distribution’s center, shape, and spread. Are there any outliers? Compare your solutions from the homework

3. Section 1.1 Part 3 AP Statistics Objective: To display quantitative variables using histograms.

4. Histograms Each row of a stemplot represents a number of data points found in a range. What kind of ranges might a stemplot have? Histograms have the same general idea, but histograms are more flexible in terms of the ranges. Ranges have equal width

5. Histograms Histograms may be less useful than stemplots because you can’t see the actual data.

6. Histograms Ranges for histograms generally include the lower end of the range, but does not include the upper end of the range

7. Using the TI-83 to make histograms The TI-83 can be used to make histograms, and will allow you to change the location and widths of the ranges.

8. Using the TI-83 to make histograms Start by entering data into a list Example: Enter the presidential data from page 19 into any list; in this case, we will use L 1

9. Using the TI-83 to make histograms Choose 2 nd :Stat Plot to choose a histogram plot Caution: Watch out for other plots that might be “turned on” or equations that might be graphed

10. Using the TI-83 to make histograms Turn the plot “on”, Choose the histogram plot. Xlist should point to the location of the data.

11. Using the TI-83 to make histograms Under the “Zoom” menu, choose option 9: ZoomStat

12. Using the TI-83 to make histograms The result is a histogram where the calculator has decided the width and location of the ranges You can use the Trace key to get information about the ranges and the frequencies

13. Using the TI-83 to make histograms You can change the size and location of the ranges by using the Window button Press the Graph button to see the results

14. Using the TI-83 to make histograms Voila! Of course, you can still change the ranges if you don’t like the results.

15. Assignment Read Pg. 18-30 Exercises 1.12 – 1.18, The Practice of Statistics (Go back and read Pg.11-17 as review)