9-47. Reconsider the percentage of titanium in an alloy used in aerospace castings from
Chapter 9, Problem 9-47(choose chapter or problem)
9-47. 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: 0.25 versus H1: 0.25 using 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
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