Author Question: McDaniel Shipyards wants to develop control charts to assess the quality of its steel plate. They ... (Read 68 times)

Chloeellawright · **on:** Dec 3, 2019

Question 1

Cartons of Plaster of Paris are supposed to weigh exactly 32 oz. Inspectors want to develop process control charts. They take ten samples of six boxes each and weigh them. Based on the following data, compute the lower and upper control limits and determine whether the process is in control.

Sample	Mean	Range
1	33.8	1.1
2	34.6	0.3
3	34.7	0.4
4	34.1	0.7
5	34.2	0.3
6	34.3	0.4
7	33.9	0.5
8	34.1	0.8
9	34.2	0.4
10	34.4	0.3

Question 2

McDaniel Shipyards wants to develop control charts to assess the quality of its steel plate. They take ten sheets of 1" steel plate and compute the number of cosmetic flaws on each roll. Each sheet is 20' by 100'. Based on the following data, develop limits for the control chart, plot the control chart, and determine whether the process is in control.

Sheet	Number of flaws
1	1
2	1
3	2
4	0
5	1
6	5
7	0
8	2
9	0
10	2

LP · **Reply #1 on:** Dec 3, 2019

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