A study of 822 patients involved testing whether or no aspirin was an effective treatment for blood clots. The following data reports on the number of patients who had a major event while monitored over a number of years. Construct a 95% confidence interval for the difference in proportions of patients ( Aspirin group -Placebo group) who had a major event.    n Number with major event Aspirin group 411 45 Placebo group 411 73 Total 822

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