Research Methodology · Research Aptitude
Which of the following correctly identifies the fundamental reason why true experimental designs achieve the highest level of internal validity for establishing causality?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1They involve multiple observations before and after an intervention to detect its effect over an extended period.
- 2They systematically identify and measure the co-variation between variables without any manipulation.
- 3They strictly employ the random assignment of participants into equivalent experimental and control groups.✓
- 4They lack formal control groups but utilize structured preliminary explorations to eliminate pre-existing differences.
Correct answer
They strictly employ the random assignment of participants into equivalent experimental and control groups.
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