You know that in the past, 70% of students in an introductory calculus class were engineering majors, 20% were
other science majors, and 10% were majors in another field. You want to know whether the distribution has changed significantly in this year's class. Which of the following is appropriate in this situation?
a. test for a population proportion, using the binomial distribution
b. chi-square test of independence
c. chi-square test of goodness of fit