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A design in which all participants participate in all experimental treatment conditions :

  • A.Pre-test post-test control group design
  • B.Post-test only design
  • C.Repeated measures design
  • D.Factorial design

Answer: C

It is a repeated measures design.

In a repeated measures (within-subjects) design each participant takes part in every treatment condition, and the measurements are compared within the same people. This controls for individual differences and needs fewer participants, though the order of conditions must be counterbalanced.

A pre-test post-test control group design and a post-test only design assign different participants to the treatment and control groups. A factorial design studies two or more independent variables at once, which may be between or within subjects.

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