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In a random sample of patient records in cutter memorial hospital, six-month postoperative exams were given in 90 out of 200 prostatectomy patients, while in paymor hospital such exams were given in 110 out of 200 cases. in comparing these two proportions, normality of the difference may be assumed because:

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BlueSky06
I think the reason why the normality of these two proportions is assumed because of n(3.13159) greater than or equal to 10 and n(1 - 3.13159) is greater than or equal to 10. Therefore, for each sample in this research, it must be taken separately. 

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