A student wants to test the effectiveness of a new cleanser against bacteria. In her experiment, she divides a countertop in half. She wipes half of the counter with the new cleanser 3 times. She wipes the other half with water 3 times. The student then took samples from each and transferred the sample to a petri dish. The students counted the number of bacterial colonies that grew on each petri dish. What is the experimental group of this experiment?
1 point
Countertop wiped with cleanser
Countertop wiped with water
Number of bacterial colonies
Number of times the countertop was wiped