Research Methodology · Experimental Validity
Which of the following are methods of controlling threats to internal validity? A. Placebo B. Blind set up C. Randomization D. Multiple treatment interference Choose the correct answer from the options given below:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1A, B, D only
- 2B, C, D only
- 3A, C, D only
- 4A, B, C only✓
Correct answer
A, B, C only
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