Question 16 A veterinary student used Zoletil (tranquiliser) to sedate 20 albino rats. He was instructed to inject 0.05 ml of the drug to each rat, however, he exceeded the dosage to 0.5 ml after observing that the rats were not responding well to the drug. After two hours, 15/20 rats died from the procedure. What threat to internal validity was observed in this scenario?

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