I would also expect hybrid cars to be used more in cities and less outside them, which could also add to a chance to hit someone, because there are more pedestrians in the cities. And so on. The conclusion should rather say, that there is no significant difference in this matter, as it isn't. (0.6 to 0.9…)
There actually is a statistically significant difference between .6 and .9 with those sample sizes. So the conclusion should in fact say that there is a statistical significance.
