A company with a large eet of cars hopes to keep gasoline costs down and sets a goal of attaining a eet average of at most 9 liters per 100 km. To see if the goal is being met, they check the gasoline usage for 28 company trips chosen at random: nding a mean of 9.78 L / 100 km and a standard deviation of 2.95 L / 100 km. Is this strong evidence that they have failed to attain their fuel economy goal? (a) Write appropriate hypotheses. [2 points] (b) Are the necessary assumptions to make inferences satised? What are those assump- tions? _3 points] (c) Compute the test statistic for the test. '4 points] (d) Find the pvalue. _3 points] (e) State an appropriate conclusion using 0: = 0.05. :3 points]