Which of the following belong to the category of true experimental design?
1.One group pre-test post-test design
2.Two groups randomized subjects post-test only design
3.Two groups static design
4.Randomised groups pre-test post-test design
5.One group time series design
AI and II only
BII and III only
CII and IV only ✓ Correct
DIV and V only
Correct answer: (C) II and IV only
Explanation
The true experimental designs here are the two-group randomised post-test only design and the randomised groups pre-test post-test design.
Statement 2 qualifies as true experimental because random assignment creates equivalent groups.
Statement 1V qualifies too, adding a pre-test to randomised groups for stronger comparison.
Statement 1, the one-group pre-test post-test design, lacks a control group and is pre-experimental.
Statement 3, the two-group static design, has no randomisation and is only pre-experimental.
Statement 5, the one-group time series design, is a quasi-experimental design without randomisation.
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