Mrs. Suyata assigned her third- and fourth-period math classes into two study groups. Which describes the variables in the two-way table? Group Assignments Group 1 Group 2 Total 3rd Period 18 14 32 4th Period 15 17 32 Total 33 31 64

The two variables are the characteristics used to classify the students: their class period and their study group. The table shows 3rd or 4th period and Group 1 or Group 2, so the correct choice is period number and study group number. The totals are counts, not a variable.

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