Quasar Exports Ltd, a fictional Turkish manufacturer of glass, wants to use a c-chart to monitor…

Quasar Exports Ltd, a fictional Turkish manufacturer of glass,
wants to use a c-chart to monitor the number of defects in the
sheets of glass it produces. The company wants to use the chart to
address the production problems it is experiencing and use it on an
ongoing basis as a monitoring tool. To construct the chart, the
company collected data over
5 days by inspecting
30 sheets of glass and recording the number defects per
sheet. The data are as follows:

Sample
Defects per Sheet
Sample
Defects per Sheet
Sample
Defects per Sheet

1
7

11

5

21

8

2
11

12

8

22

12

3
5

13

1

23

7

4
12

14

11

24

4

5
3

15

14

25

9

6

14

16

8

26

3

7

6

17

9

27

13

8

8

18

5

28

5

9

10

19

3

29

9

10

9

20

4

30

4

Using the data in the table, construct a c-chart using

3_ control limits. Why did the company choose a c-chart to
monitor this process?

  

The defects are being counted over a consistent window of
opportunity.

The defects are being counted over 5 days.

The defects per sample are being counted.

The defects are being counted over an inconsistent window of
opportunity.

The defects are being counted for a set sample size.

After making quality improvements to the process and concluding
that it is in control in the current week, the quality control
manager of Quasar collected data on the number of defects per sheet
for the following week using
20 glass sheets. The defects per sheet were as follows:

2,
7, 4,
5,
6, 4, 8,
1, 5,
3,
4,
4,
7, 2, 10,
3,
5,
6,
4, and
3. Plot the data on the c-chart, and determine whether the
process is in control.

  

The process is in control.

The process is not in control.

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