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Twelfth Grade (Grade 12) Scientific Method Questions

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Grade 12 Scientific Method
What is a study that involves no researcher intervention called?
  1. experimental study
  2. noninvolvement study
  3. observational study
  4. quasi-experimental study
Grade 12 Scientific Method
What needs to be done to an observational study in order to make it an experiment?
  1. add subjects
  2. identify a variable
  3. randomly assign groups
  4. impose a treatment
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