Which of the following belong to the category of true experimental design? A. One group pre test post test design B. Two groups randomized subjects post test only design C. Two groups static designs. D. Randomised groups pre test post test design E. One group time series design Choose the correct answer from the options given below:

Which of the following belong to the category of true experimental design? A. One group pre test post test design B. Two groups randomized subjects post test only design C. Two groups static designs. D. Randomised groups pre test post test design E. One group time series design Choose the correct answer from the options given below: Correct Answer B and D only

​Experimental design is a statistically based approach in which the researcher combines different variables. 

Key Points

• Experimental Design is genuinely experimental because the sample is chosen using randomized procedures. 
• There are numerous options designs available under "True-Experiment" are following: 
  • Two groups randomized subjects post-test only design
  • Two groups randomized matched subjects post-test only design
  • Randomized groups pre-test post-test design
  • Randomized Solomon three group design
  • Randomized Solomon four groups design

Thus, Two groups of randomized subjects with post-test only design and Randomised groups with pre-test post-test design belong to the category of true experimental design.

Hence statements B and D are correct.

Additional Information

• In a randomized experimental design, objects or individuals are assigned to an experimental group at random.
• Any multi-variable experiment must follow experimental design principles to ensure validity and efficiency.
• Four major design types with relevance to user research are experimental, quasi-experimental, correlational, and single subject.