Malani wants to determine whether children whose preschool classroom has a window differ in their receptive vocabulary as compared to children whose classroom does not have a window. At the beginning of the school year, Malani randomly assigns 10 children at Rainbow Butterfly Preschool to one of two different classrooms: one classroom has a window that looks out onto a grassy area, and the other classroom has no windows. At the end of the school year, Malani measures children on their receptive vocabulary. Is ANCOVA appropriate given this scenario?