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A hand sanitizer was advertised to be more effective at killing bacteria than any

antibacterial soap. Students were split evenly into 4 groups to test this claim.
Groups 1-3 washed their hands using the assigned hand sanitizer or soap and
warm water for two minutes, and then dried their hands with a paper towel.
Group 4 rubbed their hands vigorously for 2 minutes in warm water, without any
soap or sanitizer, and then dried their hands with a paper towel. After washing,
each student's hands were swabbed and the swab was applied to a culture plate
and incubated. Finally, the bacterial cultures were counted.

What are 3 constants of this experiment?

User Osum
by
9.0k points

1 Answer

7 votes

Answer:

warm water

two minutes of washing

paper towel

User Bryan Henry
by
8.2k points
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