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In: Statistics and Probability

Question 1 After a number of complaints about its directory assistance, a telephone company examined samples...

Question 1

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 100 calls.

SAMPLE

1

2

3

4

5

6

7

8

Number of errors

5

3

5

7

4

6

8

4

SAMPLE

9

10

11

12

13

14

15

16

Number of errors

5

9

3

4

5

6

6

7

a. Set the control limits to include 95% of random variation in complaint rate.
b. Plot the values of the sample statistic on a chart. Comment on the results.
c. Discuss THREE major management decisions related to the use of the control charts.   

Solutions

Expert Solution

Answer(a)

In this table it is can be seen that none of the sample proportions are above the upper control limit and none are below the lower control limit the process is deemed to be in control.

(c) THREE major management decisions related to the use of the control charts which mangement can take that

  1. Analyzing patterns of process variation from special causes or common causes
  2. Determining whether your quality improvement project should aim to prevent specific problems or to make fundamental changes to the process .
  3. Predicting the expected range of outcomes from a process

orchestra answered 1 year ago
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