Larry’s car averages 32 miles per gallon on the highway.  He now switches to a new motor oil that is advertised as increasing gas mileage.  After driving 3000 highway miles with the new oil, Larry estimates the new gas mileage to be 31.8.  We wish to test if the motor oil increased his gas mileage.  Which of the following are the appropriate null and alternative hypotheses, letting μ denote his new gas mileage?   The null hypothesis is H0:                             ["", "", "", ""]            The alternative hypothesis is Ha:

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