Answer: Question: Will Clean-O soap make a difference in the cleanliness of his tank mates?
Hypothesis: If Jacques cleans his tank mates with Clean-O soap, then they will be cleaner than if he only used water.
Independent variable: Clean-O soap
Dependent variable: Cleanliness of the tank mates
Control group: Tank mate only washed with water
Experimental group: Tank mate washed with Clean-O soap