Question

The data in the table below represent the number of nonconformities per 1000 meters in telephone cable.

Sample Number	Number of Nonconformities	Sample Number	Number of Nonconformities
1	1	12	6
2	1	13	9
3	3	14	11
4	7	15	15
5	8	16	8
6	10	17	3
7	5	18	6
8	13	19	7
9	0	20	4
10	19	21	9
11	24	22	20

Construct ‘c’ Chart for nonconformities for these data.

Step by step, please.

Answer 1

Solution:-

Steps:-

1.) Find as:-

2.) Find UCL and LCL for C as:-

3.)To Draw chart in Excel make column foe sample and nonconformities as follow:-

4.) Select the column and go to scatter graph in insert menu you get the graph as below then mark line UCL and Average as shown:-

To make on graph paper by hand mark the number of nonconformities on Y axis and sample nomber on X axis and make line of UCL and average(cBar) as shown above