Question 8 • PA-Common Core Math 8 Q1
Compare the relative frequencies for each time within the Thursday and Friday columns. For example, 7 pm accounts for 130/308 ≈ 42% of Thursday attendance, but 158/496 ≈ 32% of Friday attendance. Since the column relative frequencies differ, time of day and day of the week are associated. The correct choice is A: there is an association because the relative frequencies by column are different.
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