Question
In: Statistics and Probability
A sample of calls made to the customer service departments at two publishers is taken, and...
A sample of calls made to the customer service departments at two publishers is taken, and the number of minutes spent on hold is recorded. Results are shown in the table. Both populations of hold-times are normally distributed.
|
Publisher C n=32 s= 4.5 min. |
Publisher D n= 28 s= 7.3 min. |
a. Use formula/chart to test the claim that the standard deviation in hold-time is the same at both publishers. Use 0.05 significance and the critical value method.
b. Use your calculator to find the P-value associated with the claim above.
c. With 0.05 significance, test the claim that the mean time spent on hold is shorter at Publisher C. Use the P-value method with formula & chart.
d. Use your calculator to construct a 99% confidence interval estimate for the mean difference between hold-times at the two publishers.
Solutions
orchestra answered 1 year agoRelated Solutions
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2
1
3
2
4
4
5
7
6
6
7
7
8
9
6
11
6
9
4
5
5
4
6
7
2
3...
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FROM
TO
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Fabrication
Assembly
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0
%
15
%
75
%
10
%
Maintenance
55
%
0
%
35
%
10
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0
%
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35
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0
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