30. Fuel economy. A company with a large fleet of
Chapter 23, Problem 30(choose chapter or problem)
30. Fuel economy. A company with a large fleet of carshopes to keep gasoline costs down and sets a goal of attaininga fleet average of at least 26 miles per gallon. Tosee if the goal is being met, they check the gasoline usagefor 50 company trips chosen at random, finding a meanof 25.02 mpg and a standard deviation of 4.83 mpg. Is thisstrong evidence that they have failed to attain their fueleconomy goal?a) Write appropriate hypotheses.b) Are the necessary assumptions to make inferencessatisfied?c) Describe the sampling distribution model of meanfuel economy for samples like this.d) Find the P-value.e) Explain what the P-value means in this context.f) State an appropriate conclusion.
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