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# OPS 571 Statistical Process Control Methods Paper

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Statistical Process Control Methods
OPS/571
Oct 3, 2019
Mr. John Farley

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Statistical Process Control Methods
The Statistical Process Control (SPC) is a used tool to evaluate a process working at its
full potential (Chary, 2012). Often I eat at Zest Kitchen Vegan Restaurant in Rocklin, CA. After
getting to know them they told me that they deliver, and their policy is to deliver within 20-25
minutes from the time an order is placed. The data collected used is a 10 day variable of
deliveries within 20-25 minutes and deliveries not within 20-25 minutes for the (SPC).
Day
Orders
Orders Not
Delivered
Within 15-25
Minutes
Fraction of
Orders Not
Delivered
Within 15-25
Minutes
1
100
5
2
103
5
3
120
6
4
107
5
5
114
5
6
112
5
7
124
6
8
108
5
9
103
5
10
105
5
Control Chart
A control chart has three horizontal lines classified as the upper and lower control limit,
and the centerline (Jacobs & Chase, 2014). The control chart is an (SPC) tool used to see if the
process in control or not. It is in control if the numbers of occurrences are within the lower and
upper control limits of the occurrence. It is not in control when the number of occurrences goes
beyond the lower and upper control limits of the occurrence. The historical means of the process
is what the centerline indicates, and marked three standard deviations above and below the
centerline are the lower and upper control limits which tell you if the process is operating out of

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1 Statistical Process Control Methods OPS/571 Oct 3, 2019 Mr. John Farley 2 Statistical Process Control Methods The Statistical Process Control (SPC) is a used tool to evaluate a process working at its full potential (Chary, 2012). Often I eat at Zest Kitchen Vegan Restaurant in Rocklin, CA. After getting to know them they told me that they deliver, and their policy is to deliver within 20-25 minutes from the time an order is placed. The data collected used is a 10 day variable of deliveries within 20-25 minutes and deliveries not within 20-25 minutes for the (SPC). Orders Not Orders Delivered Day Received Within 15-25 Minutes 1 2 3 4 5 6 7 8 9 10 100 103 120 107 114 112 124 108 103 105 5 5 6 5 5 5 6 5 5 5 Fraction of Orders Not Delivered Within 15-25 Minutes 0.050 0.049 0.050 0.047 0.044 0.045 0.048 0.046 0.049 0.048 Control Chart A control chart has three horizontal lines classified as the upper and lower control limit, and the centerline (Jacobs & Chase, 2014). The control chart is an (SPC) tool used to see if the process in control or not. It is in control if the numbers of occurrences are within the lower and upper control limits of the occurrence. It is not in control when the number of occurrences goes beyond the lower and upper control limits of the occurrence. The historical means of the process is what the centerline indicates, and marked three standard deviations above and below the centerline are the lower and upper control limits which tell you if the proc ...
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