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HW 9 Solutions

# HW 9 Solutions - STATW1211.005 TR 02:40P-03:55P Prof Zhang...

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STATW1211.005 Prof. Zhang TR 02:40P-03:55P Homework 9 – Solutions Textbook: Probability and statistics for engineering and the sciences (7 th edition) by Jay L. Devore Chapter 9: Question 57 a. From Table A.9, column 5, row 8, . b. From column 8, row 5, . c. . d. e. f. . g. , so . h. Since , . Question 63 . The set of inequalities inside the parentheses is clearly equivalent to . Substituting the sample values and yields the confidence interval for , and taking the square root of each endpoint yields the confidence interval for . m = n = 4, so we need and . Then with s 1 = .160 and s 2 = .074, the C. I. for is (.023, 1.99), and for is (.15, 1.41).

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STATW1211.005 Prof. Zhang TR 02:40P-03:55P Chapter 10: Question 1 a. H o will be rejected if (since I – 1 = 4, and I ( J – 1 ) = (5)(3) = 15 ). The computed value of F is . Since 2.44 is not , H o is not rejected. The data does not indicate a difference in the mean tensile strengths of the different types of copper wires. b. and , and our computed value of 2.44 is between those values, it can be said that .05 < p-value < .10.
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