4 (10)

Congress regulates corporate fuel economy and sets an annual gas mileage for cars. Acompany with a large fleet of cars hopes to meet the goal of 37.2 mpg or better for their fleet of care. To see if the goal is being met. they check the gasoline usage for 42 company trips chosen at random, finding a mean of 40.20 mpg and a standard deviation of 6.72 mpg. Is this strong evidence that they have attained their fuel economy goal? Complete parts (a) through (i) below. Use 005 as the P.value cutolf level. ' W a) Write appropriate hypotheses. (The mean fuel economy of all cars in the company's eet is denoted by p.) O A. Ho: ,1: 372 HA: p=37.2 O B. H02p=372 HA: [\"5372 OC. H02p=372 HA: \">372 0 0. H0: p.=37.2 HA1p