Consider the data in Table below. This table contains data on 25 samples that were collected in an observational study in a semiconductor manufacturing plant. In this plant, the finished semiconductor is wire bonded to a frame. The variable measured is pull strength (a measure of the amount of force required to break the bond).
10
11
12
13
14
15
19
20
21
22
23
25
9.95
24.45.
31.75
35
25.02
16.86
14.38
9.6
24.35
27.5
17.08
37
41.95
11.66
21.65
17.89
69
10.3
34.93
46.59
44.88
54.12
56.63
22.13
21.15
I
• Can we conclude that the sequence of measurement of pull strength is random?
Use a = 0.05.
• Is there clustering? Is there a trend? Use a = 0.05.
• Can you conclude that the distribution of measurement of pull strength is normal?
Use a = 0.01.
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