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.

 

 

SAMPLE

 

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  

 

a.

Determine 95 percent limits. (Do not round your intermediate calculations. Round your final answers to 3 decimal places.)

 

 

 

  UCL

  

  LCL

  

 

b. Is the process stable (i.e., in control)?

Yes

No

 

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