. . . . . . "2683"^^ . . . . "2011-11-08T13:46:49+01:00"^^ . . "Experimentation" . . . . "An Experimenter conducts an Experiment based on a Hypothesis. This Experiment contains a Control_group or Control_group_member which is compared with a Treatment_group or Treated_individual in order to determine the Result. Johann's experiment proved the new drug was effective in treating the disease. Jacob placed the control group under a strong light for 20 hours each day. Rolf tested his hypothesis in Vienna in 1973."@en . . . . . . . . . . . . . . . . . . . . . . .