Reconsider the percentage of titanium in an alloy used in aerospace castings from exercise 8-52. recall that s = 0.37 and n = 51. (a) test the hypothesis h0 : σ = 0.25 versus h1 : σ ≠ 0.25 using α = 0.05.
(a) state any necessary assumptions about the underlying distribution of the data.
(b) find the p-value.
(c) explain how you could answer the question in part (a) by constructing a 95% two-sided confidence interval for σ.