In a 2009 study of effectiveness of tPa in treatment of patients who have been hospitalized after myocardial infarction, 9 of 199 males receiving tPa and 13 of 97 males in control group died within 12 months.

• Use normal-theory method to test for significant differences in 12-month mortality between two groups.
• Create observed and expected contingency tables for these data.
• Conduct test above using contingency table method.

Then differerntiate your results using two different methods.