Research Article

A Simple Approach for Monitoring Business Service Time Variation

Table 12

(a) The service times from the first ten counters in a bank branch ( ). (b) The service times from the last ten counters in a bank branch ( ).
(a)


10.880.785.065.452.936.1111.591.200.893.2123.81
23.8213.45.163.2032.273.683.141.582.727.7133.76
31.403.8910.8830.850.548.405.102.639.173.9443.78
416.88.778.363.557.761.811.115.918.267.1973.94
50.249.570.661.152.340.578.945.5411.696.5843.94
64.218.7311.442.8919.491.208.016.197.480.0764.04
715.087.434.316.1410.372.331.971.084.2714.0854.09
813.890.303.2111.329.904.3910.51.7010.741.4654.14
90.0312.762.417.411.673.704.312.453.573.3324.03
1012.8917.962.783.211.1212.614.236.182.336.9254.08
117.711.051.110.223.530.810.413.730.082.5513.92
125.816.293.462.664.0210.951.595.580.554.1033.88
132.891.611.302.5818.6510.7718.233.133.386.3443.88
141.361.920.1211.088.853.994.321.711.771.9423.79
1521.520.638.543.376.943.443.376.371.2812.8353.85

(b)


13.826.2910.8830.859.93.991.591.718.264.111.19
20.2412.7611.443.23.530.5718.232.452.726.9231.28
33.827.430.123.371.1212.611.591.080.890.0711.27
413.893.895.1611.324.020.578.016.191.776.5811.25
55.8112.762.411.153.530.8111.595.914.273.3301.19
612.898.7310.882.8918.6510.950.413.134.277.7111.18
72.890.630.120.224.0210.958.011.0810.744.101.12
816.81.051.33.22.340.814.323.130.081.4611.12
94.2117.965.060.224.023.998.015.910.553.3311.11
1012.898.7711.447.411.121.814.325.580.8914.0811.10
110.888.775.063.558.8510.9518.235.542.336.5821.15
127.717.430.122.581.122.334.232.634.273.3301.09
137.719.570.1230.857.761.813.141.712.7214.0821.14
142.891.052.4111.3232.278.41.972.4511.6912.8321.18
151.360.633.4611.320.5410.954.232.452.336.3421.22