Mr. Rigor, a math teacher at a large university, has a reputation for being a harsh grader, but has he earned that reputation? A reporter for the student newspaper selects a random sample of
60 of Mr. Rigor’s recent students and asks them what grade they earned in his class. The reporter plans to perform a chi-square goodness-of-fit test at the
α=0.01 level to determine if the distribution of grades in Mr. Rigor’s classes differs from the grade distribution for all math classes at the university. The data and the school-wide distribution of math grades is given below.
