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Assertion (A): Post hoc subgroup analysis has undermined several seeding trials.
Reason (R): Selecting a favourable subset after the event guarantees an apparent effect.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the reason gives the statistical failure, and reanalysis has overturned more than one claimed success. Pre-registration of the analysis is the accepted remedy. Several claimed successes have not survived reanalysis.

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