Monday, December 12, 2011

Which of the following is a control variable?

- bacteria becoming resistant to chemicals designed to kill them


- using different concentrations of 'ger-off'


- the company scientists making thumbprints on agar jelly


- 'ger-off' being used in hospitals





I think it is the second option but correct me if im wrong?|||The ger-off used in hospitals would be the concentration currently producing the results you wonder about. So that would be the control.





The thumbprints would provide the bacteria, and the ger-off in different concentrations would be the variable you want to study. does more help?





The first is the hypothesis

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