After a number of complaints about its directory assistance
After a number of complaints about its directory assistance, a telephone company examined samples of calls to determine the frequency of wrong numbers given to callers. Each sample consisted of 110 calls. |
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SAMPLE |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
Number of errors |
6 |
3 |
5 |
2 |
2 |
6 |
3 |
3 |
5 |
10 |
3 |
2 |
5 |
4 |
6 |
5 |
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a. |
Determine 95 percent limits. (Do not round your intermediate calculations. Round your final answers to 3 decimal places.) |
b. Is the process stable (i.e., in control)?
Yes
No