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ECON 2843 – 010
Name
Exam 1
ID #
Fall 2004
Lab Instructor
Form A
Lab Meeting Time
Students must show all work on problems that involve calculation.
Questions 1 through 4 refer to the following.
The table shows the distribution of the number of
reviewers per manuscript in a sample of new published textbooks this year.
The results are taken
from a sample of 150 reviewers.
Number of
relative
Reviewers
frequency
3 up to
5
.06
6 up to
8
.16
9 up to 11
.22
12 up to 14
.28
15 up to 17
.28
1.
Calculate the sample mean.
5
a.
.0779
b.
.67
c.
10
d.
11.68
*
e.
approximately 12
2.
What is the median age class?
a.
3 up to
5
b.
6 up to
8
c.
9 up to 11
d.
12 up to 14
*
e.
15 up to 17
3.
What is the modal class?
Both classes 12 to 14 and 15 to 16
4.
Calculate the cumulative relative frequency of the class 6  8.
a.
.16
b.
.22 *
c.
.42
d.
7
1
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Questions 5 – 9 refer to the following:
A survey of anniversary cards bought last month by husbands and wives showed that 15% of the
cards were expensive.
Among the cards bought by husbands, forty percent were expensive.
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 Spring '08
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