POLS 203
FALL 2007
MIDTERM 1
The multiple choice questions are 3 points each. Please circle one correct answer, if
more than one answer is selected, the question will be graded 0 point.
For shortanswer questions, please write all the steps in arriving at the answer. An
answer that would only report the end result will receive a 0 point.
1.
The mean score on a final exam was 75, and the standard deviation of the scores was
5. If the distribution is normal and your score was 70, what percentage of the scores
was lower than yours?
a.
15.87%
b.
30.00%
c.
34.13%
d.
50.00%
2.
On all normal curves the area between the mean and ± 1 standard deviation will be
a.
about 34% of the total area
b.
about 68% of the total area
c.
50% of the total area
d.
99.9% of the total area
In order to determine the media use of randomly selected university students, a researcher
asked which news source they trusted the most. Of the 110 female students, 30 selected
“newspapers”, 40 selected “television”, 20 selected “online news sources”, 14 selected
“radio”, and 6 said “other”. Of the 90 male students, 30 selected “newspapers”, 40
selected “television”, 17 selected “online news sources”, and 3 selected “radio”.
3.
What is the level of measurement for the variable in the research question described
above?
a.
Nominal
b.
Ordinal
c.
Interval
d.
Ratio
4.
Which measurement(s) of central tendency can you report with respect to this data?
a.
Mean
b.
Median
c.
Mode
d.
All
5.
What is the proportion of female students among those who trusted online news?
a.
1,17
b.
5,5
c.
0,54
d.
0,1
e.
None of the above
6.
What is the ratio of male to female students among those who trusted newspapers?
a.
0,81
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c.
0,5
d.
0,3
e.
None of the above
7.
The following are the scores on a test taken by 25 students.
96, 83, 59, 64, 73, 74, 80, 68, 87, 67, 64, 92, 76, 71, 68, 50, 85, 75, 81, 70, 76, 91, 69, 83,
75
a.
Make a frequency table
(5 points):
In order to summarize these numbers, it is best to group the values so the
table will not be too long. When we look at the data, the range is 50 to 96,
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 Fall '07
 Kaynak
 Standard Deviation, theft, a. b. c.

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