Warm Up
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
1.
Section 1.1
Part 3
AP Statistics
Objective: 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
10  x  20
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 still
change the
ranges if you
don’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)
