In order to check whether the variation of waiting times is in control, the quality control analyst is going to construct an R-chart. Calculate the upper control limit of this chart. (Your answer must be accurate within ±0.005 seconds.)

MATLAB: An Introduction with Applications
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Chapter1: Starting With Matlab
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To monitor the variability of waiting times at a fast food restaurant, a random sample of 4 orders is
taken between 16.00-16.30 on 12 consecutive days. The time (in seconds) that the customer(s) had
to wait for each order is shown in the table below.
Sample
1
2
3
4
5
6
7899H2
10
11
12
Date
27 May
28 May
29 May
30 May
31 May
1 June
2 June
3 June
4 June
5 June
6 June
7 June
Order 1
170
109
158
76
109
72
90
65
99
143
131
92
Order 2
161
165
80
118
118
75
130
152
82
70
122
78
Order 3
75
81
61
123
66
114
84
89
96
131
77
89
Order 4
80
113
124
100
70
171
62
179
84
146
85
176
In order to check whether the variation of waiting times is in control, the quality control analyst is
going to construct an R-chart. Calculate the upper control limit of this chart. (Your answer must be
accurate within +0.005 seconds.)
Transcribed Image Text:To monitor the variability of waiting times at a fast food restaurant, a random sample of 4 orders is taken between 16.00-16.30 on 12 consecutive days. The time (in seconds) that the customer(s) had to wait for each order is shown in the table below. Sample 1 2 3 4 5 6 7899H2 10 11 12 Date 27 May 28 May 29 May 30 May 31 May 1 June 2 June 3 June 4 June 5 June 6 June 7 June Order 1 170 109 158 76 109 72 90 65 99 143 131 92 Order 2 161 165 80 118 118 75 130 152 82 70 122 78 Order 3 75 81 61 123 66 114 84 89 96 131 77 89 Order 4 80 113 124 100 70 171 62 179 84 146 85 176 In order to check whether the variation of waiting times is in control, the quality control analyst is going to construct an R-chart. Calculate the upper control limit of this chart. (Your answer must be accurate within +0.005 seconds.)
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