With a small sample size of 3 cars of type H and 3 cars of type T, there is no possible outcome that could result in a rejection of the null hypothesis. The sample sizes too small, and there is not a table entry of a critical value for N1=3 and N2=3. In order to conduct this experiment about a quiet ride in 2 types of automobiles, you must increase the sample size.
Work Step by Step
An alternative is to increase the level of significance from .01 to .10, but from the friend's comments, this does not sound like a viable alternative.