Aspirin and heart attacks in Sweden.A Swedish study used 1360 patients who had suffered a stroke.Each patient was assigned to either aspirin treatment or placebo treatment. Patients were followed for 3 years and the number of deaths due to heart attacks was determined for each group.

Sample 1: (placebo group): n=684; number of deaths due to heart attacks=29

Sample 2: (aspirin group) n=676; number of deaths due to heart attacks=18

1. Calculate and interpret the difference of proportions.(2 points)
2. Calculate the confidence interval for the difference of proportions
3. State a null hypothesis and a two-tailed alternative hypothesis for the difference of proportions
4. Calculate the test statistic (z) for the difference of proportions
5. Based on your answers to parts a and b, is there a statistically significant difference in the proportion of deaths due to heart attack for those taking placebo versus aspirin?Explain your answer

*prefered answer in document, not scanned*