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In 'two groups, randomized subjects post test only' research design which of the following may be the source for jeopardizing validity? (A) Pretesting procedures (B) Measuring instruments (C) Interaction of selection and the independent variable (D) Reactive experimental procedures (E) Statistical regression Choose the correct answer from the options given below :

In 'two groups, randomized subjects post test only' research design which of the following may be the source for jeopardizing validity? (A) Pretesting procedures (B) Measuring instruments (C) Interaction of selection and the independent variable (D) Reactive experimental procedures (E) Statistical regression Choose the correct answer from the options given below : Correct Answer <span style="">(C) and (D) only</span>

The posttest-only control group design is a study in which at least two groups are used. 

Key Points

  • The posttest-only control group design is a simple experimental design in which individuals are randomly allocated to either receive or not receive an intervention, and the outcome of interest is evaluated only once after the intervention to determine its effect.
  • Under this design, one of which does not receive any treatment or intervention, and data on the outcome measure is obtained after the treatment or intervention.
  • The control group is the group that does not receive the treatment or intervention of interest. 
  • There are four threats to external validity: 
    • Reactive or interaction effect of testing.
    • Interaction effects of selection biases and the experimental variable.
    • Reactive effects of experimental arrangements
    • Multiple treatment interference.

​Thus, the interaction of selection and the independent variable and reactive experimental procedures are threats to validity in two groups, randomized subjects post-test research design.

Thus (C) and (D) only are correct options.

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