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 |
Step by Step Solution
There are 3 Steps involved in it
Step: 1
To analyze the response times using control charts and determine if the process is stable we can follow these steps Step 1 Organize the Data You have ...See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started