Question

The waiting time for treatment in a "minute-clinic" located in a drugstore is monitored using control charts for individuals and the moving range. Table 6E.24 contains 30 successive measurements on waiting time. TABLE 6E.24 Clinic Waiting Time for Exercise 6.66 Waiting Waiting Waiting Observation Time Observation Time Observation Time 1.14 22 2.66 4.67 1.54 5.06 3.40 1.39 1.11 6.92 30 36.99 2.49 3.39 741 2.88 0.76 1.32 7.05 1.37 6.17 5.12 21 1.34 12 13 14 15 16 17 4.35 1.67 1.63 4.88 15.19 0.67 4.14 2.16 24 27 18 20 Construct the individual moving range control chart then comment if the process under statistical process control of the following waiting time data

Answer 1

xbar.one Chart for waiting time UCL CL _.-.---LCL 1 3 5 7 912 15 18 21 24 27 30 Group Number of groups- 30 Center4.645667 LCL -6.830856 Number beyond limits 1 StdDev 3.825507UCL 16.12219 Number violating runs 0 4

0 Prom aove chaot ee at 1 Point beyens up 3o the Process ts oot of candtsol tet maving ng chart is as limt.

R Chart for waiting time_range CN UCL CL ㄧˊ + . LCL 1 3 5 7 9 12 15 1821 24 27 Group Number of groups 29 Center 4.315172 LCL 0 StdDev = 3.825507 UCL = 14.09895 Number violating runs = 5 Number beyond limits 2

Here 2 Poin beyond cpperautol limit s process isot atatistical using aleve beest le. Po cess 8em seen to L. C both chast