Determine trial control limits for an x control chart

Reference no: EM13901941

The following are X and S values for 20 subgroups of size 5.

Subgroup	X	S	Subgroup	X	S	Subgroup	X	S
1	33.8	5.1	8	36.1	4.1	15	35.6	4.8
2	37.2	5.4	9	38.2	7.3	16	36.4	4.6
3	40.4	6.1	10	32.4	6.6	17	37.2	6.1
4	39.3	5.5	11	29.7	5.1	18	31.3	5.7
5	41.1	5.2	12	31.6	5.3	19	33.6	5.5
6	40.4	4.8	13	38.4	5.8	20	36.7	4.2
7	35.0	5.0	14	40.2	6.4

(a) Determine trial control limits for an X control chart.

(b) Determine trial control limits for an S-control chart.

(d) If your answer in part (c) is no, suggest values for upper and lower control limits to be used with succeeding subgroups.

(e) If each item is supposed to have a value within 35 ± 10, what is your estimate of the percentage of items that will fall within this specification?

Reference no: EM13901941

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