Science Assessment ~ Topics ~ Control of Variables ~ Misconception CVM021

When testing for the effect of a particular variable on an outcome, it is important for that variable to vary, but only one other relevant variable has to be controlled and the rest can vary.

Items that test for misconception CVM021 in this project (Original Project) and key idea ()
Item ID Number	Item Description	How Often the Misconception was Chosen	Select This Item for My Item Bank
CV006003	An experiment in which the amount of bleach and the size of a stain on a shirt were held constant, and the type of bleach varied, could tell you which of two bleaches was better at removing stains.	15%
CV024005	An experiment in which variable X is allowed to vary and variables Y and Z are held constant could tell you if variable X has an effect on the result of the experiment.	11%