14.9 The cafeteria at the University of Barcelona, Spain, hired a group of analysts to determine the pizza best liked by students enrolled in the university.

Two years ago a similar study was conducted, and it was found that 35% of all students at the university preferred La Pizzateca, 25% chose Grosso Napoletano, 15% selected Massa Pizza, and the rest selected Picsa. A random sample of 180 students were asked to indicate their pizza preferences. The results were as follows: 42 selected Massa Pizza, 33 chose Picsa, 80 preferred La Pizzateca, and the remainder selected Grosso Napoletano. Do the data indicate that the preferences today differ from those from the last study?