CHAPTER 3
25.
The unemployment rate in the state of Alaska by month is given in the table below:
a.
What is the arithmetic mean of the Alaska unemployment rates?
7.5
(90.4/12)
b.
Find the median and the mode for the unemployment rates.
Median = 7.45 Mode =
6.5,7.3,7.8,n and 8.7)
they all appear 2 times each
c.
Compute the arithmetic mean and median for just the winter (Dec–Mar) months. Is it
much different?
Mean = 8.45 (
33.8/4)
Median = 8.7,
its higher in winter.
45.
Plywood, Inc., reported these returns on stockholder equity for the past 5 years: 4.3,
4.9, 7.2, 6.7, and 11.6. Consider these as population values.
a.
Compute the range, the arithmetic mean, the variance, and the standard deviation.
Range = 7.3
(11.6 – 4.3)
Mean = 6.94
(34.7/5)
Variance =
6.5944
(32.972/5)
Standard
deviation =
2.568
(square root of 6.5944)
b.
Compare the return on stockholder equity for Plywood, Inc., with that for Dennis
Industries cited in Exercise 44.
Dennis has a higher mean return
(11.76 > 6.94). Dennis
has a greater spread in its returns on equity (16.89 > 6.59)
54.
The mean income of a group of sample observations is $500; the standard deviation is
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 Spring '09
 Parker
 Standard Deviation, Unemployment, unemployment rates

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