working scientifically

• what is repeatable evidence?

  if the same person does an experiment again using the same methods & equipment, they'll get similar results
• how can a scientist check if their results are repeatable?

  repeat & see if results are similar
• what is reproducible evidence?

  if someone else does the experiment, or a different method & equipment is used, they'll get similar results
• if data is both repeatable & reproducible, it's reliable
• what are valid results?

  both repeatable & reproducible & answer the original question
• why do scientists repeat investigations several times?

  • calculate a mean
  • eliminate anomalies