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Stat 311 Midterm
Name:__________________
31 October 2007
Section:__________________
This is a closed book exam.
You are allowed, however, to use the formula card that came with the
textbook and to have one sheet (doublesided) of 8.5 x 11 paper with notes, either handwritten or
typed.
You may also use a calculator, although be sure to show your work.
The exam consists of
five problems worth a total of 100 points.
Point values for each part of a question are designated in
parentheses at the beginning of the problem.
Be sure to show your work as indicated in order to receive credit.
1
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Problem 1 (10+5+5):
Shown below is a histogram for eight year crown masses for 17 Douglas Fir trees.
Some summary statistics are also given.
0
50
100
150
200
250
Mass
0
2
4
6
Min
Q1
Median
Q3
Max
17.00
49.00
88.00
112.00
230.00
a)
Describe the distribution of the 17 Douglas Fir trees.
b)
Fill in the blank:
Using the five number summary, a tree with a crown mass greater than __________
would be considered a potential outlier.
Show your work in the space below.
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 Spring '08
 Tamre

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