In an experiment to test the effectiveness of a new vaccine, 50 rats received an injection of equal doses of the vaccine and 50 other rats received an injection of equal doses of a weak salt solution. Two months later, all of the rats received injections that contained equal doses of live, disease-causing organisms. The experimental results are shown in the chart below:
Effectiveness of New Vaccine
Injection: 50 Rats Received
Number of Rats That Developed the Disease
Number of Rats That Did Not Develop the Disease
Vaccine
7
43
Weak Salt Solution
48
2
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Answers: 1
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