Check normality by constructing a normal probability plot, Basic Computer Science

Check normality by constructing a normal probability plot

Twenty observations on etch uniformity on silicon wafers are taken during a qualification experiment for a plasma etcher. The data are as follows:

(a) Construct a 95 percent confidence interval estimate of σ₂ .

(b) Test the hypothesis that σ2 = 1.0. Use α = 0.05. What are your conclusions?

(d) Check normality by constructing a normal probability plot. What are your conclusions?

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