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1. The diameter of a ball bearing was measured by 12 inspectors, each using two different kinds of calipers. The results were: Inspector Caliper 1 Caliper 2 1 0.265 0.264 2 0.265 0.265 3 0.266 0.264 4 0.267 0.266 5 0.267 0.267 6 0.265 0.268 7 0.267 0.264 8 0.267 0.265 9 0.265 0.265 10 0.268 0.267 11 0.268 0.268 12 0.265 0.269 Is there a significant difference between the means of the population of measurements from which the two samples were selected? Use α = 0.05.

1. The diameter of a ball bearing was measured by 12 inspectors, each using two different kinds of calipers. The results were: Inspector Caliper 1 Caliper 2 1 0.265 0.264 2 0.265 0.265 3 0.266 0.264 4 0.267 0.266 5 0.267 0.267 6 0.265 0.268 7 0.267 0.264 8 0.267 0.265 9 0.265 0.265 10 0.268 0.267 11 0.268 0.268 12 0.265 0.269 Is there a significant difference between the means of the population of measurements from which the two samples were selected? Use α = 0.05.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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1. The diameter of a ball bearing was measured by 12 inspectors, each using two different kinds of calipers. The results were: Inspector Caliper 1 Caliper 2 1 0.265 0.264 2 0.265 0.265 3 0.266 0.264 4 0.267 0.266 5 0.267 0.267 6 0.265 0.268 7 0.267 0.264 8 0.267 0.265 9 0.265 0.265 10 0.268 0.267 11 0.268 0.268 12 0.265 0.269 Is there a significant difference between the means of the population of measurements from which the two samples were selected? Use a = 0.05. 2. An article in Journal of Strain Analysis (vol. 18, no. 2, 1983) compares several procedures for predicting the shear strength for steel plate girders. Data for nine girders in the form of the ratio of predicted to observed load for two of these procedures, the Karlsruhe and Lehigh methods, are as follows: Bridge with steel plate girder design Girder Karlsruhe Lehigh Method Method S1/1 1.186 1.061 S2/1 1.151 0.992 S3/1 1.322 1.063 S4/1 1.339 1.062 S5/1 1.200 1.065 S2/1 1.402 1.178 S2/2 1.365 1.037 S2/3 1.537 1.086 S2/4 1.559 1.052 Is there any evidence to support a claim that there is a difference in mean performance between the two methods? Use a = 0.05.
Transcribed Image Text:1. The diameter of a ball bearing was measured by 12 inspectors, each using two different kinds of calipers. The results were: Inspector Caliper 1 Caliper 2 1 0.265 0.264 2 0.265 0.265 3 0.266 0.264 4 0.267 0.266 5 0.267 0.267 6 0.265 0.268 7 0.267 0.264 8 0.267 0.265 9 0.265 0.265 10 0.268 0.267 11 0.268 0.268 12 0.265 0.269 Is there a significant difference between the means of the population of measurements from which the two samples were selected? Use a = 0.05. 2. An article in Journal of Strain Analysis (vol. 18, no. 2, 1983) compares several procedures for predicting the shear strength for steel plate girders. Data for nine girders in the form of the ratio of predicted to observed load for two of these procedures, the Karlsruhe and Lehigh methods, are as follows: Bridge with steel plate girder design Girder Karlsruhe Lehigh Method Method S1/1 1.186 1.061 S2/1 1.151 0.992 S3/1 1.322 1.063 S4/1 1.339 1.062 S5/1 1.200 1.065 S2/1 1.402 1.178 S2/2 1.365 1.037 S2/3 1.537 1.086 S2/4 1.559 1.052 Is there any evidence to support a claim that there is a difference in mean performance between the two methods? Use a = 0.05.
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