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Indian Tribe Identification
Anthropologists have identified four Indian tribes in Montana: Big Goose, Little Bear,
Crazy Horse, and Buffalo. Arrowheads from each tribe differed in size. Below is data on
the size of the arrowheads from each tribe.
Length
(mm)
Big Goose
Little
Bear
Crazy
Horse
Buffalo
Width
(mm)
Mean
25.4
26.3
Std. Dev.
5.7
4.9
Mean
13.3
14.4
Std. Dev.
1.5
1.6
Neck
Width
(mm)
Mean
8.7
10.1
35.8
7.1
18.6
2.3
12.7
1.7
45.8
11.3
20.7
2.3
13.3
1.7
Std. Dev.
1.5
1.6
You are junior anthropologists on a dig and have uncovered the remains of a new Indian
settlement. Eleven arrowheads are found at the site and it is hoped that the size of the
arrowheads will help identify the tribe as one of the four previously discovered tribes.
Measure the arrowheads (in mm) and record your data below.
Length (mm)
Width (mm)
Neck Width (mm)
1. Draw an appropriate graphical display for each of the data sets (Length, Width,
Neck Width) of the unknown tribe.
AP Statistics
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2. Calculate summary statistics for each data set. (Mean, Std. Dev., 5 number
summary, outliers)
3. Identify the unknown tribe using statistical reasoning.
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Name___________________ Hr____