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The percentage of titanium in an alloy used in aerospace castings is measured in 55 randomly...

The percentage of titanium in an alloy used in aerospace castings is measured in 55 randomly selected parts. The sample standard deviation is s=0.35. Construct a 95% two-sided CI for ?.
(a) Test the hypothesis ?0:?=0.25 vs ?1:?≠0.25 using ?=0.05. Find the ?-value.
(b) Explain how you could answer the question in part (a) by constructing a 95% two-sided confidence interval for ?.

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