Question: A certain doctor reported the results of a clinical trial comparing the effectiveness of four drugs regiments randomly assigned for treatment of patients following the onset of a heart attack. Each was given one of the four drug regiments. The outcome measure compared was the proportion of severe adverse events, that is, death or disabling stroke reported within 30 days of treatment.

The data are presented in the following table:

At the 0.05 level of significance, determine whether there is evidence of a significance difference among the four drug regimens with respect to the proportion of patients suffering from severe adverse effect within 30 days following treatment for heart attack.

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