Download TI-83 Worksheet Number 21

TI-83 Worksheet Number 21
Statistics – Histograms
Following is a list of countries and the percent of ninth graders who have used marijuana.
Make a histogram of the data.
Austria 10%
France 12%
Italy 19%
Portugal 7%
Belgium 19%
Germany 21%
Luxembourg 6%
Scotland 53%
Denmark 17%
Greece 2%
Netherlands 31%
Spain 15%
England 40%
Iceland 10%
No. Ireland 23%
Sweden 6%
Finland 5%
Ireland 37%
Norway 6%
Switzerland 27%
The histogram will show the “percent usage” categories on the x-axis and the number of
countries in the individual categories on the y-axis. We need only to enter the percentages,
not the countries. A histogram is a one-variable display graph.
Key Strokes
(Enter Data)
Stat
1
(Clear list if not empty)
▲◄
Clear Enter
10 Enter 19 Enter …27 Enter
2nd Statplot
1
Enter
▼►►
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Comment
Displays the
statistics menu
Selects the list
editor
Move cursor to highlight L1
Clears list 1
Enters the percentages in the list
Displays statplot menu
Selects first of 3
statplots
Turns statplot 1 on
Highlights the histogram icon (3rd type)
WS 21 Page 1 of 2
Enter
▼ 2nd L1
▼1
Zoom 9
Trace
►
(Change the range of data an the width of
intervals)
Window
Xmin=0 Xmax=60, Xscl=10
Graph Trace
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Selects histogram type
Selects L1 as XList
Sets frequency to one (If you can’t type a 1, it
is because the calculator is in alpha mode. Hit
the ALPHA key to take calculator out of alpha
mode.
Selects standard
statistics window –
Displays histogram
Displays properties of the histogram. Indicates
the first intgerval category is [2, 12.2), and n=9
numbers in that category.
Indicates the second category is [12.2, 22.4)
and n=6 numbers in that categroy
Displays window
settings.
Xscl=10 sets the size of the categories at 10
units wide
Displays the
histogram with
the revised range
and category size.
WS 21 Page 2 of 2