Appropriate control limits for the data, Operation Management

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A quality team at Milburn Textiles has been charged with setting up control charts to monitor a key dyeing process that has been improved and now stable. The ideal temperature for the process is 140 degrees. Too high a temperature results in excessively dark fabric. Too low a temperature results in streaking. Daily temperature readings are taken of the dye vats as shown below. [+2 pts.]

	Observation
Day	1	2	3	4	5	Avg.	Range
1	136	137	144	141	138	139.2	8
2	143	138	140	140	139	140.0	5
3	140	141	144	137	135	139.4	9
4	139	138	141	140	141	140.0	2
5	137	141	143	140	138	139.2	6
6	142	141	140	139	138	140.0	4
7	143	139	143	140	140	141.4	3
8	139	138	141	140	136	139.0	5
9	140	141	143	141	139	140.2	5
10	139	141	142	140	136	139.6	6

a. What is the appropriate control chart(s) the quality team should use?

b. What are the appropriate control limits for the data?

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