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Normal25 mean
Frequency
Normal100 mean
Histogram of Normal25 mean, Normal100 mean
Azfar Khandoker
Dr. Knapp
STAT 350 4:30
Lab #3
1.
a)
i)
I would have expected the statistic to be 50.
ii) The left histogram is much broader at its base than the histogram on the
right. They are both unimodal, but the histogram on the right is more
prominently unimodal.
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Normal25 stdev
Frequency
Normal100 stdev
Histogram of Normal25 stdev, Normal100 stdev
iii) The mean for the 25 sample histogram is 49.943. The mean for the 100
sample histogram is 49.907.
iv) Yes; the mean does seem to be affected as the number of samples increases.
This is due to the fact that as the number of samples increases, the sample
statistic gets closer to the actual population parameter.
v)
The standard deviation of the 25 sample histogram is 1.093. The standard
deviation for the 100 sample histogram is 0.445.
vi) Yes; the standard deviation gets smaller as the number of samples gets larger.
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 Spring '08
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