An experiment reported in Popular Science compared fuel economies for two types of similarly equipped diesel mini-trucks. Let us suppose that 12 Volkswagen and 10 Toyota trucks were tested in 90-kilometer-per-hour steady- paced trials. If the 12 Volkswagen trucks averaged 16 kilometers per liter with a standard deviation of 1.0 kilometer per liter and the 10 Toyota trucks averaged 11 kilometers per liter with a standard deviation of 0.8 kilometer per liter, Using 0.05 level of significance, determine if the mean if the fuel economy of for the average kilometers per liter for these two mini-trucks are equal. Assume that the distances per liter for the truck models are approximately normally distributed with equal variances.

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