Question

Sample	Size	No. Defective
1	80	4
2	72	2
3	68	3
4	81	3
5	75	4
6	70	4
7	82	5
8	64	1
9	73	1
10	78	5
11	70	3
12	74	4
13	83	1
14	76	12
15	66	4
16	70	7
17	71	4
18	82	7
19	73	4
20	67	6
21	80	2
22	79	7
23	81	2
24	81	4
25	78	4
26	79	1
27	84	4
28	66	2
29	74	4
30	80	4

(a) use the data n the table to construct a standardized p-chart,

(b) interpret your chart, and

(c) give reasons for out-of-control conditions

Answer 1

a) refer to the image above.

b) p chart shows that there are special cause variations, making the or process out of control.

c) the reason for out of control process:

* Proportion values are not within the control limits.

* There are lot of special cause variations.

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