Refer to the data on the school buses in the Buena School District.
a. Assume the distribution of the maintenance cost for the three bus manufacturers does not follow a normal distribution. Conduct a test of hypothesis at the .05 significance level to determine whether the distributions differ.
b. Assume the distribution of the maintenance cost for the bus capacities does not follow a normal distribution. Conduct a test of hypothesis at the .05 significance level to determine whether the distributions differ.
c. Assume the distribution of the maintenance cost for the bus types, diesel or gasoline, does not follow a normal distribution. Conduct a test of hypothesis at the .05 significance level to determine whether the distributions differ.