5. Each of 30 business schools was rated according to student exposure to social and environment issues in the classroom. Ratings ranged from 1 star (lowest rated group) to 5 star (highest rated group). A summary of the star ratings assigned to the 30 MBA programs is reproduced in the table. Criteria 5 stars 4 stars 3 stars 2 stars 1 stars Student Exposure 2 9 14 5 0 Test whether there are differences in star rating category proportions in the population of all MBA programs at 0.05 level of significance.