An article presents a study of the effect of the subbase thickness on the amount

Question

An article presents a study of the effect of the subbase thickness on the amount of surface deflection caused by aircraft landing on an airport runway. In six applications of a 155 kN load on a runway with a subbase thickness of 401 mm. the average surface deflection was 3.25 nun with a standard deviation of 0.51 mm. Can you conclude that the mean surface deflection is greater than 3 mm? Round the test statistic to four decimal places. Since the P-value is. We conclude that the mean surface defined is greater than 3 mm.

Explanation / Answer

here std error =std deviation/(n)1/2 =0.2082

hence test stat t=(X-mean)/std error =1.2007

for above at 5 degree of freedom ; p value =0.1418 we can not conclude that the mean surface deflection is greater then 3

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