A Study Was Conducted to Compare Fuel Consumption of Medium-Size

Essay

A study was conducted to compare fuel consumption of medium-size trucks for three brands of gasoline, A, B, and C. Four trucks of the same make and model were used in the experiment, and each gasoline brand was tested in each truck. Using each brand in the same truck has the effect of eliminating (blocking out) truck-to-truck variability. The data (litres per 100 km) are as follows:
Automobile Use an appropriate method to identify the pairwise differences, if any, in the average fuel consumptions for the three brands of gasoline.