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COURSE:
MSCI 3710.004
Print Name:
EXAM 3
Signature:
Sample Version
S.S.#:
SEMESTER: Spring 1998
Seat 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.
For this sample version, the correct answers are given on a separate sheet at the end.
Use the following information in the paragraph below to answer the next four questions
.
A production supervisor told the quality manager that certain parts are more likely to be rejected
by one inspector than by the other inspector.
To investigate this report, the quality manager
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View Full Documentproduced the following table from a random sample of all parts rejected. This table gives
frequencies for three types of parts rejected by the two inspectors.
NUMBER OF PARTS REJECTED
Part #1
Part #2
Part #3
Inspector
Total
A
12
26
21
59
B
15
21
27
63
Total
27
47
48
122
1.
To test the supervisor’s concern, what null hypothesis would you use?
A.
Ho: Each part is rejected with equal frequency.
B.
Ho: The inspector rejecting the part is independent of the type of part.
C.
Ho: Each inspector rejects the same number of parts.
D.
Ho: The type of part rejected is dependent upon the inspector.
E.
Ho: The inspectors are not homogeneous with respect to the type of part rejected.
2.
What is the expected value of the number of part #3s rejected by inspector B?
A.
27.00
B.
13.94
C.
22.73
D.
23.21
E.
24.79
3.
If the calculated value of the test statistic is 8.563 and α = 0.10, the conclusion is
A.
There is sufficient evidence that the type of part rejected and inspectors are dependent.
B.
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 Spring '08
 Dr.Jay

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