The weights (in pounds) of eight vehicles and the variability of their braking distances (in feet) when stopping on a wet surface are shown in the table below.

a) At the 5 % level of significance can you conclude that there is a significant linear correlation between vehicle weight and variability in braking distance on a wet surface?

b)Is weight a useful predictor of braking distance ?

Weight, x 5890 5340 6500 4800 5940 5600 5100 5850 Variability in braking 2.92 2.40 4.09 1.72 2.88 2.53 2.32 2.78 distance, y