Chapter 5, Problem 036 An article in the Journal of Strain Analysis (1983, Vol.

Question

Chapter 5, Problem 036 An article in the Journal of Strain Analysis (1983, Vol. 18, No. 2) compares several methods for predicting the shear strength for steel plate girders. Data for two of these methods, the Karlsruhe and Lehigh procedures, when applied to nine specific girders, are shown in the accompanying Table. Construct a 95% confidence interval on the difference in mean shear strength for the two methods Girder Karlsuhe Method Lehigh Method S1/1 S2/1 S3/1 S4/1 S5/1 S2/1 S2/2 S2/3 S2/4 1.190 1.147 1.326 1.343 1.207 1.412 1.370 1.534 1.566 1.058 1.002 1.064 1.062 1.060 1.188 1.032 1.085 1.060 The 95% confidence interval is ( 98.7654) Round your answers to four decimal places (e.g

Explanation / Answer

The statistical software output for this problem is:

Paired T confidence interval:
D = 1 - 2 : Mean of the difference between Karlsuhe Method and Lehigh Method
95% confidence interval results:

Hence,

95% confidence interval will be:

(0.1728, 0.3792)

Difference Mean Std. Err. DF L. Limit U. Limit Karlsuhe Method - Lehigh Method 0.276 0.044742473 8 0.17282367 0.37917633

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