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Just a note

Notice that, because we are suggesting pig age is an explanatory variable, by convention it is plotted along the x-axis. Whereas, on a contingency table, by convention the explanatory variable runs vertically. However, just because a variable is plotted on the x-axis, or used to label rows, does not imply it is an explanatory variable.

Unit 12 explores this rich source of confusion in rather more depth.