The table shows the gas mileage (in miles per gallon) of eight cars with and without using a fuel additive. Your friend claims that the fuel additive improved gas mileage.
Car 1 2 3 4 5 6 7 8
Gas mileage without additive 35.8 37.7 39.4 36.8 36.6 33.7 38.4 37.3
Gas mileage with additive 36.2 39.8 40.1 39.3 36.9 34.5 38.8 39.1
a. State the null and the alternative hypotheses.
b. At a=0.01, test your friend’s claim.
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The table shows the gas mileage (in miles per gallon) of eight cars with and without using a fuel additive. Your friend claims that the fuel additive improved gas mileage.
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