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Problem

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question

A teacher believes that giving her students a practice quiz every week will motivate them to study harder, leading to a greater overall understanding of the course material. She tries this technique for a year, and everyone in the class achieves a grade of at least C. Is this an experiment or an observational study?

choices

  1. An experiment, but with no reasonable conclusion possible about cause and effect
  2. An experiment, thus making cause and effect a reasonable conclusion
  3. An observational study, because there was no use of a control group
  4. An observational study, but a poorly designed one because randomization was not used

subject

high_school_statistics

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