IE 330
Homework 8
1.
c
.
The graph appears not to be normally distributed; the pvalue is above 0.05, which also indicate
the sample is not normally distributed.
d.
Mean = 40.6, medium = 35. From the graph, the central tendency seems to be the medium.
e.
Although all data fills within the 95% confidence interval, the Pvalue is 0.067, which is greater
than 0.05, the data is not normally distributed.
f.
Sign test of median =
21.00 versus not = 21.00
N
Below
Equal
Above
P
Median
Sample Days between Incidents
10
0
1
9
0.0039
35.00
The Pvalue is very small, which indicate the null hypothesis is wrong, the medium is not 21.
The new mean should be 35.
g.
For Wilcoxon signed rank test to work the sample needs to be symmetric, this data is not
symmetric.
2.
b.
Pvalue is higher than 0.05, sample is not normally distributed.
c.
The sample is symmetric, which means the assumptions for Wilcoxon signed rank test is
met.
d.
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 Spring '08
 Statistics, Normal Distribution, Wilcoxon, Estimated Median

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