Question

What are the threats to validity in a research study? Explain each briefly.

What are the threats to validity in a research study? Explain each briefly.

Homework Answers

Answer #1

Factors which jeopardize validity are as below:-

  • History-- The different events which occurs between the two consecutive measurements can affect the validity.
  • Maturation-- The different processes in different subjects which perform as a function of the time which indicates that if a project continues for some years, the performance of many participants will be improved.
  • Testing-- The outcomes of a test which has the influence on the outcome of other tests.
  • Instrumentation-- Any kind of alteration in the scorers, instrument, observers which can have some changes in the final results can also impact validity.
  • Statistical regression-- It is also famous as regression to the mean. This has mainly resulted from the subject selection depending on the extreme scores.
  • Selection of subjects-- The validity can also be threatened due to the biases in the selection of comparison groups. This can be overcome by random selection.
  • Experimental mortality-- This is mainly the result of the loss of subject. The different subjects who remain with the team till the completion are motivated to learn a lot and thus have greater performance level.
  • John Henry effect-- John Henry was mainly an employee who outperformed a machine while conducting an experiment as he knew that his performance is being measured against the machine.
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