ANSWERS: 3
  • Sometimes. But if they do, the conclusion is classified as "a posteriori" and in order for it to be significant, the statistical analysis is much more rigorous. The classic experiment (like the ones we do for science fairs in grade school) tend to be "a priori" and usually the outcome is just a hypothesis.
  • True knowledge? No. Only theories and previous experiments, which require the assumption that the laws of physics are uniform.
  • Theories and results of other experimentation, possibly even their own previous experimentation.

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