500
My cat, Jack, does not always like to use his litter pan. I try four different types of litter to see which one he prefers. After putting each type of litter in four litter boxes that are identical, Jack likes the unscented, scoopable litter the best.
The dependent variable is the types of litter.
Is this a valid experiment? (bonus question)
What is false. The dependent variable is which litter he prefers to use. Remember: it is the result or outcome of the experiment. What am I trying to find out?
It is a valid experiment because I only changed one variable: the type of litter.