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Two quality control technicians measured the surface finish of a metal part, obtaining the data in Table 4E.1. Assume that the measurements are normally distributed.
Two quality control technicians measured the surface finish of a
(a)Test the hypothesis that the mean surface finish measurements made by the two technicians are equal. Use a = 0.05 and assume equal variances.
(b) What are the practical implications of the test in part (a)?
(c) Assuming that the variances are equal, construct a 95% confidence interval on the mean
difference in surface-finish measurements.
(d) Test the hypothesis that the variances of the measurements made by the two technicians are equal. Use What are the practical implications if the null hypothesis is rejected?
(e) Construct a 95% confidence interval estimate of the ratio of the variances of technician measurement error.
(f) Construct a 95% confidence interval on the variance of measurement error for technician 2.
(g) Does the normality assumption seem reasonable for the data?
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