Question: Question 5

A certain doctor reported the results of a clinical trail 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, t hat 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.