Metalcraft Enterprises, Inc. manufactures precision tubular parts. One such part is a cylindrical tube with specified...
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Metalcraft Enterprises, Inc. manufactures precision tubular parts. One such part is a cylindrical tube with specified diameter of 4 cm. Suppose a random sample of 16 of these tubes yields an average diameter of 3.985 cm with a standard deviation of 0.01 cm. 1.Based on the sample data, the 99% confidence interval estimate of the mean diameter, μ, of these tubes is: 2.
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Homework Answers
1. From the t table, for 15 degrees of freedom,
the 99% confidence interval for the critical t values is:
Substituting t with the test statistic:
2. Since 4 does not lie in the 99% confidence interval, we reject the null hypothesis and conclude that the p-value of the test is less than 0.99. B is correct.
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