An engineer would like to design a parking garage in the most cost-effective manner. The garage must be able to fit pickup trucks, which have an average height of 76.4 inches. To double-check this figure, the engineer employs a statistician. The statistician selects a random sample of 100 trucks, which will be used to determine if these data provide convincing evidence that the true mean height of all trucks is greater than 76.4 inches.