Aprofessor states that in the united states the proportion of college students who own iphones is .66. she then splits the class into two groups: group 1 with students whose last name begins with a-k and group 2 with students whose last name begins with l-z. she then asks each group to count how many in that group own iphones and to calculate the group proportion of iphone ownership. for group 1 the proportion is p1 and for group 2 the proportion is p2. to calculate the proportion you take the number of iphone owners and divide by the total number of students in the group. you will get a number between 0 and 1.