Question

04. The following table gives the results of daily inspection of a
vacuum tube. The standard value of fraction defective p' established at
the start of the month was 0:04. The estimated daily average production
was 1600 tubes.
(a) Establish a single set of control limits based on these figures and
plot a control chart.
b) Compute separate control limits for any points that seem to be
required by you.
(o) Based on this month's record, what would you recommend as
the value of p' to use for the following month ?
Date Number Fraction Date Number Fraction
Inspected Defective
Inspected Defective
Nov. 2
531 0-0471
16
2331
0 0322
3 1393 , 0.0445 17
2009
0-0403
4 1422 0.0428
18
2198
0-0392
5
1500 0-0487
19
2271
0·0295
6 1250 0.0368
20
1948
0-0210
7. 2000 C-0290
21
2150
0 0358
9
685 0·0408
23
1700
0-0288
10 2385 0-0373
24
2214
0-0307
11 -2150 0-0414
25
2394
0-0343
12 2150 0.0270
26
1197
0-0468
13 2417 0-0476
17
850
0-0318
14 2549 0-0451 .28
848
0-0353
30
850
0.0388​

Answer 1

Answer:

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