Question: The standard deviation of critical dimension thickness in semiconductor manufacturing is = 20 nm. (a) State the null and alternative hypotheses used to demonstrate

The standard deviation of critical dimension thickness in semiconductor manufacturing is σ = 20 nm.

(a) State the null and alternative hypotheses used to demonstrate that the standard deviation is reduced.

(b) Assume that the previous test does not reject the null hypothesis. Does this result provide strong evidence that the standard deviation has not been reduced? Explain.

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