Control charts for X-bar and s are to be established on the Brinell hardness of hardened tool steel in kilograms per square millimeter. Data for subgroup sizes of 8 are shown below. Determine the trial central line and control limits for the X-bar and s charts. Assume that the out-of-control points have assignable causes. Calculate the revised limits and central line.

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Control charts for X-bar and s are to be established on the Brinell hardness of hardened tool steel in kilograms per square millimeter. Data for subgroup sizes of 8 are shown below. Determine the trial central line and control limits for the X-bar and s charts. Assume that the out-of-control points have assignable causes. Calculate the revised limits and central line.

 

Control charts for X and s are to be established on the Brinell hardness of hardened tool steel in kilograms per square
millimeter. Data for subgroup sizes of 8 are shown below. Determine the trial central line and control limits for the X and s
charts. Assume that the out-of-control points have assignable causes. Calculate the revised limits and central line.
Subgroup Number xs Subgroup Number x s
1
540 26
14
551 24
2
534 23
15
52229
3
545 24
16
579 26
4
561 27
17
549 28
576 25
18
508 23
6
523 50
19
569 22
571 29
20
574 28
8.
547 29
21
56333
9
58423
22
561 23
10
55224
23
548 25
11
541 28
24
556 27
12
545 25
25
553 23
13
546 26
Transcribed Image Text:Control charts for X and s are to be established on the Brinell hardness of hardened tool steel in kilograms per square millimeter. Data for subgroup sizes of 8 are shown below. Determine the trial central line and control limits for the X and s charts. Assume that the out-of-control points have assignable causes. Calculate the revised limits and central line. Subgroup Number xs Subgroup Number x s 1 540 26 14 551 24 2 534 23 15 52229 3 545 24 16 579 26 4 561 27 17 549 28 576 25 18 508 23 6 523 50 19 569 22 571 29 20 574 28 8. 547 29 21 56333 9 58423 22 561 23 10 55224 23 548 25 11 541 28 24 556 27 12 545 25 25 553 23 13 546 26
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