Question: In a study comparing response rates between treated and non treated subjects, 30% of subjects are observed to have both responded and been treated. If

In a study comparing response rates between treated and non treated subjects, 30% of subjects are observed to have both responded and been treated. If we also know that a randomization ratio of 1:1 was used ( e.g. 1 out of every 2 subjects were treated ), then we can calculate that the probability of response among treated subjects is

A. 0.9

B. 0.6

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