Suppose that two new trees are identified, with Tree-1 having a diameter of 15 inches and a height
of 70 feet, while Tree-2 has a diameter of 12 inches and a height of 80 feet. Which tree will have more
wood? The fitted values of the regression model are 36.38 cubic feet for Tree-1 and 25.65 cubic feet
for Tree-2, and with confidence level 95% Eq. (6) gives