For each of the following, using the p-value approach, perform the five steps of hypothesis testing.

A company claims that the new model of truck gets 18 miles per gallon. The dealership feels this claim is too low and takes a sample of 16 of these trucks, drives them 1000 miles, and records the fuel mileage of each truck. It is found that the new truck has a mean fuel mileage of 20 miles per gallon with a population standard deviation equal to 3 miles per gallon. Assuming that the gas mileage is normally distributed, do the data provide sufficient evidence at the 1% significance level, to conclude that the fuel mileage is more than claimed?