An article in the Journal of Strain Analysis (Vol 18, No. 2, 1983) compares several procedures...

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 the ratio of predicted to observed load for two of these procedures on 9 girders are collected using paired comparative experiment are displayed 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	1.2	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

(a) Is there any evidence to support a claim that there is a difference in mean performance of the two methods? Using α = 0.05?

(b) What is the p-value for the test in part (a)?

(c) Construct a 95% confidence interval for the difference in mean ratio of predicted to observed load.

Expert Solution

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orchestra answered 2 years ago

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