Gasoline efficiency ratings were obtained on a random sample of 12 automobiles, 6 each of two different models. These ratings were taken at five different times for each of the 12 automobiles.

a. Compute the mean efficiency for each model at each time point, and plot these data.
b. Draw conclusions from the analysis of variance. Use a 5.05.
c. What effects, if any, do the Greenhouse-Geisser and Huynh-Feldt correction factors have on the within-model comparisons? Psy.

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