The percentage of titanium in an alloy used in aerospace castings is measured in 51 randomly…

The percentage of titanium in an alloy used in aerospace castings is measured in 51 randomly…

The percentage of titanium in an alloy used in aerospace castings is measured in 51 randomly selected parts. The sample standard deviation is s = 0.37.

(a) Test the hypothesis   using α = 0.05. State any necessary assumptions about the underlying distribution of the data.

(b) Find the P-value for this test.

(c) Construct a 95% two-sided CI for σ.

(d) Use the CI in part (c) to test the hypothesis.

 

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