23. An experiment was devised to test the effects of running 3 different types of gasoline with 3 possible types of additive. The experiment called for 9 identical motors to be run with 5 gallons for each of the pairs of gasoline and additives. The following data resulted

(a) Test the hypothesis that the gasoline used does not affect the mileage.

(b) Test the hypothesis that the additives are equivalent.

(c) What assumptions are you making?

Transcribed Image Text:

Mileage Obtained Additive Gasoline 1 2 3 124.1 131.5 127 2 126.4 130.6 128.4 3 127.2 132.7 125.6