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COURSE:
MSCI 3710.001
Print Name:
EXAM 2
Signature:
Version A
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.
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View Full Document Use the information given in the paragraph below to answer the next six questions.
A smallengine repair shop can specialorder parts from any one of the three
different warehouses and receive a substantial discount on the price. The
manager of the shop is concerned with the length of time that it takes to
specialorder a part from one of the warehouses. The number of days it takes
to specialorder a part is recorded for 15 randomly selected orders from each
of the three warehouses, as shown in the following table.
A
B
C
13
7
10
17
12
12
14
8
18
10
15
19
9
6
9
15
10
15
18
12
20
11
10
11
13
8
15
18
14
13
16
10
17
13
6
13
15
9
10
12
13
14
16
11
16
The manager uses the data to test the claim, at the .05 significance level,
that there is a difference in the mean times that it takes to specialorder a
part from a warehouse. The results of the ANOVA (conducted a the α = .05
level) are shown in the partially filled table below.
ANOVA:
Single
Factor
SUMMARY
Groups
Count
Sum
Average
Variance
Warehouse A
15
210
14
7.7143
Warehouse B
15
151
10.0667
7.7810
Warehouse C
15
212
14.1333
11.6952
ANOVA
Source of Variation
SS
df
MS
F
Pvalue
F crit
Among Groups
xxx.xx
2
xx.xx
x.xx
0.0006
x.xx
Within Groups
380.67
xx
xx.xx
Total
540.8
44
1. Which of the following is the correct alternative hypothesis?
A.
Ha: the mean time to special order is not the same for all three
warehouses
B.
Ha: the mean time to special order is the same for all three warehouses
C.
Ha: the mean time to special order from each warehouse is different from
the others
D.
Ha: the mean time to special order is most different for warehouse C
E.
Ha: the mean time to special order is the same among blocks of time
2.
What is the calculated value of the test statistic to test the claim there is
a difference in the mean times to specialorder a part from a warehouse?
A
3.23
B.
8.83
C.
80.07
D
151
E.
.0006
3.
What is the critical (table) value for the test in question #2?
A
3.23
B.
8.83
C.
80.07
D
151
E.
.0006
4.
What is the variation, as measured by the sum of squares, of sample
means about the grand mean?
A.
540.8
B.
380.67
C.
160.13
D.
80.07
E.
9.06
5.
What are the statistical decision and reason for the decision concerning
the test in question #2?
A.
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This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.
 Spring '08
 Dr.Jay

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