AP Statistics Problem

Many new products introduced into the market are targeted toward children. The choice behavior of children with regard to new products is of particular interest to companies that design marketing strategies for these products. As part of one study, randomly selected children in different age groups were compared on their ability to sort new products into the correct product category (milk or juice). Here are some of the data: Researchers want to know if a greater proportion of 6- to 7-year-olds can sort correctly than 4- to 5-year-olds. So Ho : P1 - P2 = 0, Ha : P1 - pz