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150 animals are given a vaccine and 150 are not (300 in total). All 300 exposed to disease: Among those vaccinated: 10 contracted disease. Among

150 animals are given a vaccine and 150 are not (300 in total).

All 300 exposed to disease:

Among those vaccinated: 10 contracted disease.

Among those not vaccinated: 30 contracted disease.

Can we conclude vaccine is effective in reducing infection rate?

Significance level .025.

State null and alternate hypothesis.

Find test statistic.

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