Table 5E.3 presents 20 subgroups of five measurements on the time it takes to service a customer.
Question:
Table 5E.3 presents 20 subgroups of five measurements on the time it takes to service a customer.
a. Set up and R control charts for this process and verify that it is in statistical control.
b. Following establishing of the control charts in part (a), 10 new samples have been provided in Table 5E.4. Plot the new and R values using the control chart limits you established in part (a) and draw conclusions.
Transcribed Image Text:
Sample Number x X R 138.1 110.8 138.7 137.4 125.4 130.1 27.9 149.3 142.1 105.0 134.0 92.3 124.5 57.0 115.9 135.6 124.2 155.0 117.4 129.6 39.1 118.5 116.5 130.2 122.6 100.2 117.6 30.0 108.2 123.8 117.1 142.4 150.9 128.5 42.7 102.8 112.0 135.0 135.0 145.8 126.1 43.0 120.4 84.3 112.8 118.5 119.3 111.0 36.1 132.7 151.1 124.0 123.9 105.1 127.4 46.0 136.4 126.2 154.7 127.1 173.2 143.5 46.9 135.0 115.4 149.1 138.3 130.4 133.6 33.7 139.6 127.9 151.1 143.7 110.5 134.6 40.6 125.3 160.2 130.4 152.4 165.1 146.7 39.8 145.7 101.8 149.5 113.3 151.8 132.4 50.0 138.6 139.0 131.9 140.2 141.1 138.1 9.2 110.1 114.6 165.1 113.8 139.6 128.7 54.8 145.2 101.0 154.6 120.2 117.3 127.6 53.3 125.9 135.3 121.5 147.9 105.0 127.1 42.9 129.7 97.3 130.5 109.0 150.5 123.4 53.2 123.4 150.0 161.6 148.4 154.2 147.5 38.3 144.8 138.3 119.6 151.8 142.7 139.4 32.2 4 10 12 13 14 15 16 17 18 19 20
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Related Book For
Managing Controlling and Improving Quality
ISBN: 978-0471697916
1st edition
Authors: Douglas C. Montgomery, Cheryl L. Jennings, Michele E. Pfund
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