This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Assignment 2 (On-campus students: due 3pm Friday 09/16/2011 ; off-campus students: due midnight Saturday 09/17/2011 ) 1. An article in the 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 given as follows: Girder Karlsruhe Method Lehigh 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 S2/2 1.402 1.178 S2/3 1.365 1.037 S2/4 1.537 1.086 S2/5 1.559 1.052 a) Is there any evidence to support the claim that there is a difference in mean performance between the two methods? Use α = 5%. b) What is the P-value for the test in part a? c) Construct a 95 percent confidence interval for the difference in mean predicted to observed load ratio d) Investigate the normality assumption for both samples....
View Full Document
- Fall '08
- Ratio, Probability theory, Karlsruhe Method, Lehigh Method