Question: Reconsider the percentage of titanium in an alloy used in aerospace castings from Exercise 8-39. Recall that s = 0.37 and n = 51. (a)

Reconsider the percentage of titanium in an alloy used in aerospace castings from Exercise 8-39. Recall that s = 0.37 and n = 51.
(a) Test the hypothesis H0: σ = 0.25 versus H1: σ = 0.25 using a = 0.05. State any necessary assumptions about the underlying distribution of the data.
(b) Explain how you could answer the question in part (a) by constructing a 95% two-sided confidence interval for σ.

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