1. AP Statistics September 5, 2008 CASA
Section 1.1 Part 3
AP Statistics
September 5, 2008
CASA

2. 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

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

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

5. 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.

6. 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 L1

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

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

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

10. 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

11. 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

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

13. Assignment
Exercises 1.12 – 1.18, The Practice of Statistics