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Twenty observations on etch uniformity on silicon wafers are taken during a qualification experiment for a plasma etcher. The data are as follows:
|
Etch Uniformity |
||||
|
5.34 |
6.65 |
4.76 |
5.98 |
7.25 |
|
6.00 |
7.55 |
5.54 |
5.62 |
6.21 |
|
5.97 |
7.35 |
5.44 |
4.39 |
4.98 |
|
5.25 |
6.35 |
4.61 |
6.00 |
5.32 |
(a) Discuss the normality assumption and its role in this problem.
(b) Check normality by constructing a normal probability plot. What are your conclusions?
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