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Administering the treatment and then comparing time 3 against some external standard [ Choose ] Comparing time 1 against time 3, after the treatment [

Administering the treatment and then comparing "time 3" against some external standard [ Choose ] Comparing "time 1" against "time 3", after the treatment [ Choose ] Administer treatment to Group 1 and then measure, but withhold treatment from Group 2: compare two groups [ Choose ]

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