Ms. Brown's class designed an experiment to test the effectiveness of a well-advertised hand sanitizer. They compared the hand sanitizer with two brands of soap and water. As a control, the students rubbed their hands together for two minutes in warm water and then dried them with a towel. Their results are shown in the data table. When analyzing and interpreting the data which hand washing method is LEAST effective in killing bacteria?

Ms. Brown's class designed an experiment to test the effectiveness of a well-advertised hand sanitizer. They compared the hand sanitizer with two brands of soap and water. As a control, the students rubbed their hands together for two minutes in warm water and then dried them with a towel. Their results are shown in the data table.

When analyzing and interpreting the data which hand washing method is LEAST effective in killing bacteria?