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Discussion

A target and control design in a seeding experiment is used to

  • A.avoid the need for any randomisation altogether
  • B.reduce the variance by comparing against a nearby unseeded area
  • C.increase the quantity of agent delivered into the cloud being treated
  • D.guarantee that the seeding will produce more rainfall

Answer: B

Correlating the two areas before the trial allows natural variation to be partly removed. The design still requires randomisation, since the correlation alone does not establish causation. Design and randomisation must work together.

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