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biology

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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?

  • biology -

    Shouldn't she vaccinate half the rats and then expose all of them to the disease?

  • biology -

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

  • biology -

    Give vaccinations to 50 of the 100 rats and then expose all 100 to the disease

  • biology -

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

  • biology -

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

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