Appropriate control limits for the data, Operation Management

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?

Posted Date: 2/25/2013 12:02:39 AM | Location : United States







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