ECO 203
Lilly, Spring 2008
You are allowed to use your notes and the text. You are also allowed to use EXCEL. I request
that you do
not
discuss this quiz with any other person. I trust that you will be honorable. You
need to return your answers to me by classtime Wednesday (the 5
th
.
(1) Which of the following statements is true?
a.
The mean of a population will always be larger than the population
standard deviation.
b.
The mean of the population will generally be larger than the mean of the
sample selected from that population.
c.
The population mean and a sample mean for a sample selected from that
population will usually be different values.
d.
None of the above.
(2)
Consider the following sample data:
25
11
6
4
2
17
9
6
For these data the median is:
a.
7.5.
b.
3.5.
c.
10.
d.
None of the above.
(3)
A sample of people who have attended a college football game at your university has a mean
= 3.2 members in their family.
The mode number of family members is 2 and the median number
is 2.0.
Based on this information:
a.
the population mean exceeds 3.2.
b.
the distribution is bellshaped.
c.
the distribution is rightskewed.
d.
the distribution is leftskewed
.
(4)
If a data set has 740 values that have been sorted from low to high, which value in the data
set will be the 20
th
percentile?
a.
The average of the 148
th
and 149
th
values
b.
The 20
th
value
c.
The 148
th
value
d.
None of the above.
(5)
If a data set has 1,133 sorted values, what value corresponds to the 3
rd
quartile?
a.
The 250
th
value
b.
The 840
th
value
c.
The 760
th
value
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None of the above.
(6)
The following data reflect the number of customers who return merchandise for a refund on
Monday.
Note these data reflect the population of all 10 Mondays for which data are available.
Based on these data, what is the standard deviation?
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 Spring '08
 Lilly
 Statistics, Standard Deviation, Mean, a. b. c.

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