$\backslash$table$[[$Definition$,$Term$],[$The way in which total cost behaves or changes, when some measure of activity changes.,None of these are correct$],[$The range of activity over which assumptions about cost behavior hold true.,$\backslash$table$[[$Contribution margin$],[$Contribution margin income:$]]],[$A cost that changes in total in direct proportion to changes in activity while the per unit cost remains constant.$],[$A cost that is fixed over a narrow range of activity and increases multiple times across a relevant range.$],[$A cost that remains the same in total regardless of the activity level.$],[$Both the total cost and the cost per unit change with the level of activity.,Contribution margin ratio$],[$A cost that is fixed over a wide range of activity, but increases when a capacity limit is reached.$],[$The expression of the relationship between total cost and activity expressed as $y=a+b(x).,$Fixed cost$],[$tvisual representation of the relationship between total cost and activity level.,Scattergraph$],[$The use of the two most extreme activity points to determine the variable cost per unit.,Relevant range$],[$A measure of how well the data are represented by the formula $y=a+b(x),$Contribution margin$],[$The difference between sales revenue and variable costs.,Contribution margin$],[$The difference between the unit sales price and the unit variable costs.,Unit contribution margin$],[$Unit contribution margin divided by the unit sales price.,Contribution margin ratio$],[$An external reporting method that reflects both the fixed and variable manufacturing costs in cost of goods sold.,Linearity assumption$],[$A costing method that focuses on cost behavior.,Step$-$variable cost$]]$