A student hypothesizes that green algae will grow fastest when exposed to blue light. To test this hypothesis, the student should design an experiment with which independent variable (IV)?

Sandy is conducting an investigation to find out which food her dog likes best. Which is the dependent variable (DV) in her investigation?

In an experiment, Jackson tested to see how the size of rocks affects the amount of dirt that washes away when water flows downhill. Which variable is the independent variable (IV)?

You design an experiment to test the affect of temperature on bacteria growth. You use three bacteria cultures under three heat lamps at different temperatures. What is the dependent variable (DV) in this experiment?

A medical researcher hypothesizes that a new medication can reduce high blood pressure. Which of these would most likely be the dependent variable (DV) in a study involving this medication?

In an experiment about growth, some snapdragons seeds were placed in a dish lined with moist paper towels at different temperatures. Which of these is the independent variable in the experiment? 

Does the amount of salt change the ability of an object to float or sink? Amount of salt is the...

How does the incline of a board affect how far a ball will roll? Distance the ball rolls is the...

Does playing classical music improve memory? Playing classical music is the...

What is true of an independent variable (IV).

What is true about a dependent variable (DV).