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STATS FINAL EXAM
*
1.
A population of data from a paper supply company is known to have a mean weight of 55 ounces
per ream and a population standard deviation of 5 ounces. The population is known to be bell
shaped and symmetrical. Which of the following statements is correct description given what we
know from the empirical rule.
a)
68% of the reams will be within 50 and 70 ounces
b)
99.7% of the reams will be within 54 ounces and 56 ounces
c)
99.7% of the reams will be within 45 and 65 ounces
d)
B and C
e)
None of the above
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2.
What is the median of the following data set: (13, 19, 45, 26)
a)
64
b)
32
c)
13
d)
22.5
e)
none of the above
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3.
True or False: A pie chart would be an improper selection to display continuous numerical data.
True False
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4.
Logan took the SAT. Her score was a 1600 out of 2400. The average for the test is a 1400 and the
population's standard deviation is 50. What percentile rank of students is Logan in based on her
SAT score.
a)
0 to 20
b)
21 to 40
c)
41 to 60
d)
61 to 80
e)
81 to
100
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*
5.
Determine the probability that a sample of 25 widgets will have a mean weight between 399
grams and 403 grams. Past records show that the population mean is 400 grams and the
population standard deviation is 10. There will be ____________ probability that the sample is
between 399 and 403. Select the closest possible answer to fill in the blank above.
a)
approximately
.20
b)
approximately
.40
c)
approximately
.60
d)
approximately
.80
e)
approximately
.100
*
6.
If you use the sample size equation and get a result of n=9.015, how many people should you
sample?
a)
12
b)
14
c)
9.015
d)
1.96
e)
10
*
7.
True or False: A Z score of 1.5 means that the value under consideration is 1.5 standard
deviations above the mean.
True False
8.
Calculate the sample mean given the following information:
a)
between 0 and 6.49
b)
between 6.50 and 7.89
c)
between 7.90 and 9.99
d)
between 10 and 20
e)
over 20.1
STATS FINAL EXAM
*
9.
If a survey asked each person their gender, what type of data would be collected?
a)
numerical and discrete
b)
numerical and continuous
c)
numerical and either discrete or continuous
d)
categorical
e)
none of the above
10.
You are a manager at a firm and you believe your monthly costs have decreased. The costs have
always been $9,000 but you now believe they are less and would like to test this claim. If you
run a hypothesis test, which of the following statements would fit your problem?
a)
You have a lower tail test
b)
Your alternative hypothesis could be stated as the population mean is less than 9,000
c)
Your null hypothesis could be stated as the population mean is greater than or equal to 9,000.
d)
A, B, and C are correct
e)
Just B and C are correct
A, B, and C are correct
*
11.
True or False: Your sample is (700, 706, 706, 710). The sample standard deviation is
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This note was uploaded on 02/05/2011 for the course OPRE 201 taught by Professor Clark during the Fall '10 term at University of Baltimore.
 Fall '10
 Clark

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