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Question 673:



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    1. Weights of identical twins
      since they are essentially the same, this is dependent
    2. The effectiveness of two different brands of ibuprofen
      Different groups, so independent
    3. Effect of a new training program on time taken to complete a task, measured by a "before" and "after" test
      if the same people are used in both before and after and their data is matched, then this is dependent.
    4. Test scores of a group of students on a math test and a biology test.
      Dependent. There is likely a pretty good correlation between the same students math score and biology score, but it is not dependent in the same way as a matched set of data.

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