Every Tuesday afternoon during the school year, a certain university brought in a visiting speaker to present a lecture on some topic of current interest. On the day after the fourth lecture of the year, random samples of 70 freshmen, 70 sophomores, 60 juniors, and 50 seniors were selected from the student body at the university, and each of these students was asked how many of the four lectures she had attended. The results are given in Table 10.26. Test the hypothesis that freshmen, sophomores, juniors, and seniors at the university attended the lectures with equal frequency.
Table 10.26 Data for Exercise 3

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Number of lectures attended 0 4 Freshmen Sophomores Juniors Seniors 10 16 27 611 14 15 15 17 49 19 8 6512 1920 4 13