Ronald wants to see if a new shower cleaner works better in removing soap build up than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. 30 points!

A general rule to help you remember the difference is that:
1) The independent variable is what you're changing in an experiment
2) The dependent variable is what you're measuring, and it's something whose measurement could change depending on whatever the independent variable is.

So in Ronald's experiment, he is changing the type of shower cleaner, making that your independent variable. He is hoping to measure the amount of soap build up that results from the change of shower cleaner, making that your dependent variable.

Independent Variable: Type of shower cleaner
Dependent Variable: Amount of soap build up