Unformatted text preview: deviation of σ = 0.0001 inch. A random sample of 10 shafts has an average diameter of 0.2545 inches. (a) Set up the appropriate hypotheses on the mean μ . H : µ = .255 versus H 1 : µ ≠ .255 (b) Test these hypotheses using = 0.05. What are your conclusions? 15.18 Since Z /2= .025=1.96 we reject the null hypothesis (c) Find the Pvalue for this test. P=2(1phi(15.81)) =2(11)=0 (d) Construct a 95 percent confidence interval on the mean shaft diameter. .254438 Less than or = to mu less than or = to .254562...
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 Spring '10
 Dr.Joshi
 Statistics, Null hypothesis, Statistical hypothesis testing

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