Question: The article Effect of Granular Subbase Thickness on Airfield Pavement Structural Response (K. Gopalakrishnan and M. Thompson, Journal of Materials in Civil Engineering, 2008:331342) presents

The article “Effect of Granular Subbase Thickness on Airfield Pavement Structural Response” (K.

Gopalakrishnan and M. Thompson, Journal of Materials in Civil Engineering, 2008:331–342) presents a study of the effect of the subbase thickness (in mm)

on the amount of surface deflection caused by aircraft landing on an airport runway. Two landing gears, one simulating a Boeing 747 aircraft, and the other a Boeing 777 aircraft, were trafficked across four test sections of runway. The results are presented in the following table.

Section 1234 Boeing 747 4.01 3.87 3.72 3.76 Boeing 777 4.57 4.48 4.36 4.43 Can you conclude that the mean deflection is greater for the Boeing 777?

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