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Mathematics, 01.12.2021 19:10 yuhhhhh2801
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. Test that the number of lectures attended is independent of which year students are in.
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