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LSAT.065 Base Rates and Conditional Percentages
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A news article says a preventive treatment cuts the risk of an event by 80 percent. The underlying study found 5 events per 100,000 untreated people and 1 event per 100,000 treated people. Which one of the following is the best interpretation?
A
The treatment prevents the event in 80 percent of all treated people.
B
The treatment lowers the risk by 80 percentage points.
C
The relative reduction is 80 percent, but the absolute reduction is 4 events per 100,000 people.
D
The study shows that four-fifths of all events are caused by lack of treatment.
E
The event becomes impossible for 99,999 of every 100,000 treated people because of the treatment.
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