Question

A company with a large fleet of cars hopes to keep gasoline costs down and sets...

A company with a large fleet of cars hopes to keep gasoline costs down and sets a goal of attaining a fleet average of 27 mpg. To see if the goal is being met, they check the gasoline usage of 50 company cars at random, finding a sample mean of 26.12 mpg and a sample standard deviation of 4.83 mpg. We wish to determine if there is strong evidence that they failed to attain their fuel economy goal.

a) Write the appropriate hypotheses for this Hypothesis Test. Be sure to label your variables.

b) Find the P-value. You may use your calculator. Tell me which function you are using.

c) State your conclusions.

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