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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 bacterialſ cultures were counted. What group is the
control group?
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A hand sanitizer was advertised to be more effective at killing bacteria than any
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