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The Statistics Involved in Experiments

The Statistics Involved in Experiments. Carl Hamblyn. SO_P. S_AR. Designing an Experiment. An experiment is a set of observations made under conditioned controlled by the observer Experiments allow us to claim cause and effect (if correctly designed). Components of Experiment. Question

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The Statistics Involved in Experiments

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  1. The Statistics Involved in Experiments Carl Hamblyn

  2. SO_P

  3. S_AR

  4. Designing an Experiment • An experiment is a set of observations made under conditioned controlled by the observer • Experiments allow us to claim cause and effect (if correctly designed)

  5. Components of Experiment • Question • Variables • Design • Replication • Blocking • Randomisation

  6. Question • Question • Variables • Design • Replication • Blocking • Randomisation

  7. Question (try to be precise) • “The purpose of this experiment is to see if… • … has an effect on…” • E.g. “The purpose of this experiment is to see if adding nitrate solution has an effect on the yield of tomatoes at harvest time.

  8. Variables • Question • Variables • Design • Replication • Blocking • Randomisation

  9. Independent and Dependent • Independent – the treatment • Dependent – the one you measure

  10. Replication • Question • Variables • Design • Replication • Blocking • Randomisation

  11. Not just once…

  12. Components of Experiment • Question • Variables • Design • Replication • Blocking • Randomisation

  13. Blocking (homogeneous groups)

  14. Randomisation • Question • Variables • Design • Replication • Blocking • Randomisation

  15. Experiment Group andControl Group Random allocation is important

  16. Year 12 vsYear 13 • Comparison between two groups • need a control group. • need an experimental group • Comparison within the same group • before and after. • with the treatment, without the treatment

  17. Ideas and help • BBC website (google BBC psychology test) • Census at School website

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