Research Methodology · Experimental Research
Which of the following factors affect the internal validity of an experimental research? A. Placebo effect B. Instrument Decay C. Contemporary events D. Hawthorne effect E. Bias in selecting subjects in sample Choose the most appropriate answer from the options given below:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1C, D and E Only
- 2A, C and D Only
- 3B, C and D Only
- 4B, C and E Only✓
Correct answer
B, C and E Only
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