Problem 18: The article "Effect of Granular Sub base Thickness on Airfield Pavement Structural Response"presents a study of the effect of the sub base 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, and the other a Boeing777 aircraft, were trafficked across four test sections of runway. The results are presented in the following table. \text { Can you conclude that the mean deflection is greater for the Boeing } 777 ? \text { Use } a=0.01 Can you conclude that the mean deflection is greater for the Boeing 777? Use a = 0.01

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