Homework Help: biology

Posted by Meelah on Sunday, July 31, 2011 at 5:41pm.

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 - Ms. Sue, Sunday, July 31, 2011 at 5:46pm
Shouldn't she vaccinate half the rats and then expose all of them to the disease?
biology - nick, Wednesday, May 23, 2012 at 3:31pm
give vaccinations to 50 of the 100 rats and then expose all 100 to the disease
biology - Samantha, Sunday, May 5, 2013 at 3:59pm
Give vaccinations to 50 of the 100 rats and then expose all 100 to the disease

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