We wish to test if a certain vaccine developed for a
disease is effective or not. What is the best way to do
this?
A
Vaccinate 100 animals
and expose all 100 to the
disease.
B
Vaccinate 100 animals
and expose 50 of them to
the disease.
C
Vaccinate 50 animals, do
not vaccinate 50 other
animals, and expose all
100 to the disease.
D
Vaccinate 50 animals, do
not vaccinate 50 other
animals, and expose the
vaccinated animals to the
disease.
Answers: 2
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