biology

A scientist wishes to determine how effective a vaccine is in protecting rats against a contagious disease. What experimental procedure should the scientist use to determine the vaccine's effectiveness?

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asked by Meelah
  1. Shouldn't she vaccinate half the rats and then expose all of them to the disease?

  2. give vaccinations to 50 of the 100 rats and then expose all 100 to the disease

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    posted by nick
  3. Give vaccinations to 50 of the 100 rats and then expose all 100 to the disease

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    posted by Samantha
  4. D) vaccinate 50 of the 100 rats and then expose only 50 vaccinated rats to the disease.

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  5. Vaccinate 50 of the rats then expose only the 50 vaccinated rats to the disease

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    posted by Kristin

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