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DSCI207
Spring 2009
Sample Exam
Instructions:
For multiple choice questions, circle the letter of the BEST answer.
For paired choices (with a blank line), CHECK the line next to your choice.
For short answer questions, confine your answers to the space reserved.
This exam counts 20% of your semester grade.
MULTIPLE CHOICE
[2 points each]
Circle the letter of the BEST answer.
1
The amount of television viewed by today’s youth is of primary concern to Parents Against Watching Television (PAWT).
250 parents of elementary schoolaged children were asked to estimate the number of hours per week that their child watches
television. Identify the type of data collected by PAWT.
A
qualitative
B
quantitative
2
The bar graph (at right) shows the political affiliation of 1,000
registered U.S. voters.
What percentage of the voters belonged to
one of the traditional two parties (Democratic or Republican)?
A
35%
B
75%
C
25%
D
40%
3
The distribution of salaries of professional basketball players is skewed to the right. Which measure of central tendency would be
the best measure to determine the location of the center of the distribution?
A
mode
B
mean
C
median
D
range
4
Four hundred accidents that occurred on a Saturday night were analyzed. The number of vehicles involved and whether alcohol
played a role in the accident were recorded. The results are shown below:
Number of Vehicles Involved
Did Alcohol Play a Role?
1
2
3 or more
Total
Yes
52
97
21
170
No
28
175
27
230
Total
80
272
48
400
What is the probability that an accident involved a single car without the effect of alcohol?
A
1/5
B
7/20
C
7/100
D
13/100
5
Two events, A and B, are independent if
p
(A and B) =
p
(A) ×
p
(B)
A
true
B
false
6
Classify the following random variable according to whether it is discrete or continuous:
The temperature in degrees Fahrenheit on July 4
th
in Juneau, Alaska
A
discrete
B
continuous
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faculty. Understanding this, I declare I have not nor will I give, use,
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View Full Document7
Consider the given discrete probability distribution:
x
2
4
6
8
p
(
x
)
0.14
?
0.25
0.04
Find the probability that
x
equals 4.
A
1.72
B
0.43
C
0.57
D
2.28
8
A physical fitness association is including the mile run in its secondaryschool fitness test. The time for this event for boys in
secondary school is known to possess a normal distribution with a mean of 470 seconds and a standard deviation of 60 seconds.
Between what times do we expect approximately 95% of the boys to run the mile?
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 Spring '11
 Garret

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