This figure shоws grаphed medicаl reseаrch results frоm a study оn a new vaccine. The research was done in an effort to determine if a new vaccine would be effective in preventing potentially dangerous rotavirus infections in infants. Green data bars represent occurrence of infant cases that had normal rotavirus strains that aren't critically dangerous. Blue data bars represent occurrence of infant cases that had more dangerous rotavirus strains that can hospitalize or lead to fatality of infants. In this experiment, if the scientists giving the placebo (low, medium, or high vaccine doses) did not know which dose they were administering, then this would be an example of a double-blind experiment.
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