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10 March, 03:06

Ned is designing an experiment to test which hand sanitizer kills the most E. coli bacteria. In order for Ned's results to be valid, what must he do?

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Answers (2)
  1. 10 March, 03:12
    0
    Have a control. You have to have something to compare your experimental results or else your results could be random chance.
  2. 10 March, 03:36
    0
    Test the hand sanitizers on bacterial colonies that are kept in the exact same environmental conditions, such as temperature and light level
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