ECON 2843 – 010
Name
Final Exam
ID #
Fall 2003
Lab Instructor
Form A
Students must show all work on calculation problems, even if the answer is multiple choice.
Questions 1 through 4 refer to the following.
The manager of the KCPA takes a random sample
of the ages of those attending the Great Hall series at regular ticket rates, yielding the following:
Age
Frequency
25 up to 35
4
35 up to 45
8
45 up to 55
12
55 up to 65
1
1.
Calculate the mean for the sample.
a.
36
b.
44
c.
45
d.
46.33
e.
50
2.
Calculate the standard deviation for this sample.
a.
3.6
b.
8.165
c.
12
d.
66.67
e.
1,600
3.
What is the modal class for this sample?
a.
25 up to 35
b.
35 up to 45
c.
45 up to 55
d.
55 up to 65
e.
all of the above
4.
The manager claims that the average (mean) age for all those attending this series
equals 46.6 years.
Assuming that the population is distributed normally, test this claim
against a twosided alternative at a 10 % level of significance.
1
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You wish to estimate the weekday pedestrian traffic flow that crosses Lindsey Street each
noon hour.
This distribution is normal with a population standard deviation of 300.
If
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 Fall '08
 HUDGINS
 Statistics, Normal Distribution, Standard Deviation, Variance, Statistical hypothesis testing

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