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Survey, experiment or study?, step by step

Half the plants, chosen at random, are given the new fertilizer.

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The question

A cafe asks 80 randomly picked customers to rank four new dishes. Which kind of study is this?

Ask first whether anything was assigned

was anything assigned?
not assigned
Sample survey
  1. A cafe asks 80 randomly picked customers to rank four new dishes. Start with the one question that settles it: was anything DONE to anybody?
  2. Nothing was done to anyone here — nobody was given a treatment or put into a group. The people are being ASKED something rather than measured, which is what separates a survey from an observational study.
  3. Ranking on request is an opinion asked for: a sample survey.

How it works.

  1. 01

    A cafe asks 80 randomly picked customers to rank four new dishes. Start with the one question that settles it: was anything DONE to anybody?

  2. 02

    Nothing was done to anyone here — nobody was given a treatment or put into a group. The people are being ASKED something rather than measured, which is what separates a survey from an observational study.

  3. 03

    Ranking on request is an opinion asked for: a sample survey.

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