In Roman numerals, it means 4.The letters I.V. mean "intravenous", a needle attached to a vein through which medications or fluids can be added to the bloodstream.
The IV = Independent Variable The DV = Dependent Variable AND!! In science you'll learn: Hypothesis = an "If...,then" statement > EXAMPLE > If I mix red paint with blue paint, then it will turn...
the iv is what you change and the dv depends on what changes. the iv is usually on the bottom of a graph and the dv is usually at the side, but depending on the graph, the order could be vise versa.