In this part of the question, you should calculate the required confidence interval by hand, using tables, and show your working In a large study of patients who were being treated for hypertension (high blood pressure), 148 out of 5493 patients receiving the conventional treatment for hypertension later suffered a stroke. Also, 192 out of 5492 patients receiving an alternative drug to treat their hypertension later suffered a stroke. (i) Obtain an approximate 95% confidence interval for the difference in proportions between the number of conventionally treated hypertension patients who later suffered a stroke and the number of hypertension patients treated with the alternative drug who later suffered a stroke. (You are advised to work with proportions rounded to four decimal places throughout; also, you may assume that the numbers involved are large enough that your approximation is a good one.) (ii) Some clinicians had suggested that the proportions of hypertension patients who suffered a stroke would not depend on which treatment they were being given. Are the data consistent with that suggestion? Justify your answer briefly. h (United Kingdom) IT Focus MacBook