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

Section 1.1Part 3

AP StatisticsObjective: To display quantitative variables using histograms.

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

Histograms

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

Histograms

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

2010 x

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.

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

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

Using the TI-83 to make histograms

Turn the plot “on”, Choose the histogram

plot. Xlist should point to

the location of the data.

Using the TI-83 to make histograms

Under the “Zoom” menu, choose option 9: ZoomStat

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

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

Using the TI-83 to make histograms

Voila! Of course,

you can stillchange the ranges if youdon’t like the results.

Assignment

Read Pg. 18-30 Exercises 1.12 – 1.18, The Practice of

Statistics (Go back and read Pg.11-17 as review)