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In a clinical trial of a new drug intended to treat asthma, 4 of the 90 subjects in the treatment group experienced a cough, and

In a clinical trial of a new drug intended to treat asthma, 4 of the 90 subjects in the treatment group experienced a cough, and 12 of the 150 subjects in the control group had a cough. The difference is calculated to be significant at the 0.05 level. Determine the meaning of this significance level.

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