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CSS Statistics QUESTION #1974
Question 1
In an experimental study, the experimental error mainly arises from which source?
  • Mistakes made by the experimenter
  • Uncontrolled extraneous (external) factors✔️
  • Differences in treatment effects
  • All of the above
Correct Answer Explanation
Experimental error primarily results from extraneous (nuisance) factors not controlled in the experiment. It represents unexplained variability beyond the treatment effects.