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The quality manager of a computer services company wants to create a specification for the amount of time it takes the company to respond to

The quality manager of a computer services company wants to create a specification for the amount of time it takes the company to respond to problems reported by customers. The goal time limits is 10 hours (i.e., 600 minutes) at most. To determine how well the company meets the specification, data are collected on the response times over recent weeks, based on three customers chosen at random in each week. The data consist of the response time (in minutes) for three customers each over 32 weeks. The data are shown below and included on the course Blackboard site. Use control chart(s) to determine if the process is stable. Eliminate all subgroups that constitute Shewhart rule violations assuming that a root cause is found and eliminated.

Week Response Time (Min.)
1 450 522 522
2 300 570 426
3 534 486 540
4 462 606 354
5 474 582 354
6 444 462 528
7 426 282 600
8 438 456 528
9 492 576 558
10 402 546 504
11 510 426 336
12 510 342 444
13 402 474 546
14 366 438 444
15 510 510 522
16 492 510 504
17 480 576 420
18 630 474 462
19 546 342 408
20 612 600 570
21 564 558 486
22 486 588 432
23 468 390 492
24 366 462 372
25 498 534 582
26 420 408 426
27 432 558 510
28 504 630 456
29 462 396 510
30 336 426 528
31 480 402 462
32 498 480 324

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