COURSE:
MSCI 3710
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EXAM 1
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Version D
S.S.#:
SEMESTER: Spring 2001
Section Number:
Note: Whenever question(s) are connected you may be asked to assume a result (given a
value) from the previous question but this result may or may not be correct.
This is to
prevent you from losing points on a second question because you made a mistake on a
previous question.
Use the information given in the paragraph below to answer the next three questions
.
Instructions:
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Please print your name, social security number, and section number
on this exam.
Also, put your signature on this exam.
P
On your scantron
PRINT
your name, your version, and your section
number.
To better protect your privacy also print your name on the
backside of your scantron.
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You have
75 minutes
to complete this exam.
The exam is open
book, open notes, and open mind.
You may use any type of
calculator but please show all your work on the exam and mark all
answers on the scantron.
P
Many of the questions follow the format of those in Adventures in
Business Statistics.
The remaining questions are either based on the
Excel assignment or use an Adventureslike approach with problems
nearly identical to those assigned in the textbook.
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When you have completed the exam, please insert your scantron into
the exam booklet and turn them in to your instructor.
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No cheating.
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Good luck and we wish you well on the exam.
1
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View Full DocumentAn engineer has designed a valve that will regulate water pressure on an automobile
engine.
The engineer designed the valve such that it would produce a mean pressure of
6.9 lbs./sq. inch.
The valve was tested on 160 engines and the average pressure was 6.8
lbs./sq. inch with a variance of 0.49 lbs./sq. inch.
Is there evidence at the 0.10 level
that the valve does not perform to the specifications?
1.
What are the null hypothesis and alternative hypothesis for this test?
A.
Ho:
μ
=
6.9
Ha:
μ
P
≠
6.9 *
B.
Ho:
μ
≥
6.9
Ha:
μ
<
6.9
C.
Ho:
μ
=
6.8
Ha:
μ
≠
6.8
D.
Ho:
μ
>
6.9
Ha:
μ
≠
6.9
E.
Ho:
μ
=
6.8
Ha:
μ
≠
6.8
2.
What is the calculated value of the test statistic?
A.
–1.81 *
B.
–3.40
C.
3.40
D.
2.58
E.
2.42
3.
Assuming the calculated value of the test statistic is 2.50, what are the decision and
conclusion of the test?
A.
Fail to reject the null hypothesis, conclude there is insufficient evidence of Ha.
B.
Fail to reject the null hypothesis, conclude there is evidence of Ha.
C.
Reject the null hypothesis, conclude there is evidence of Ho.
D.
Reject the null hypothesis, conclude there is evidence of Ha. *
E.
Reject the null hypothesis, conclude there is insufficient evidence of Ha.
Use the information given in the paragraph below to answer the next two questions
.
The mayor of a town believes that above 25% of the residents favor annexation of an
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 Spring '09
 staff
 Statistics, Statistical hypothesis testing, Statistical significance, b. c. d., A. B. C. D., A. B. C. D. E. Ho

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