An art teacher recorded whether the students in three of her classes prefer water color or oil painting. The art teacher plans to create a two-way table to analyze her results. Which variables can the art teacher use as the row and column headings of the table?

A two-way table organizes counts by two categorical variables. Here, the variables are class number (one of three classes) and painting preference (water color or oil painting). The table can use these as its row and column headings, so the correct choice is class number and painting preference.

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