STAT 350 – Fall 2008
Lab #1 
SOLUTION
DUE:
Friday, September 5
th
@ the beginning of class
For the following problems, use the data in the accompanying Excel spreadsheet.
This assignment is
to be done using Minitab.
1.
Create a frequency histogram of the data using the following cutpoints:
0, 10, 20, 30, 40, 50, 60,
70, 80, 90, 100, and 110.
100
80
60
40
20
0
50
40
30
20
10
0
C2
Frequency
2.
Based on the histogram you created, determine whether an observation of 10 would fall between
0 and 10 or between 10 and 20.
There are 50 observations ranging from 1 to 9 and 58 observations ranging from 1 to 10.
Clearly
all the 10's are going between 10 and 20, otherwise the height of the first bar would be 58 instead
of 50
3.
Create a density histogram of the data using the same cutpoints as in (1).
Compare to the
histogram from part (1).
Is one more appropriate than the other?
100
80
60
40
20
0
0.035
0.030
0.025
0.020
0.015
0.010
0.005
0.000
C2
Density
The two histograms are identical except for the scale (tick mark labels) of the yaxis.
But all
proportions are the same.
Neither one of these graphs are more appropriate than the other.
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 Fall '08
 Staff
 Harshad number, Histogram, Kernel density estimation

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