The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Recently two methods of cPAP; conventional and bubble cPAP were compared. In the conventional method, 90 out of 160 showed extubation failure while 40 out of 160 showed extubation failure in bubble method, which test would be the best to compare the statistical significance between the rates of extubation failure in the two tests?   (A) Chi square test   (B) Student's test   (C) Paired t test   (D) Analysis of variance
['(A) Chi square test <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', "(A) Chi square test \n (B) Student's test \n (C) Paired t test \n (D) Analysis of variance <> possible answers", '  Recently two methods of cPAP; conventional and bubble cPAP were compared. In the conventional method, 90 out of 160 showed extubation failure while 40 out of 160 showed extubation failure in bubble method, which test would be the best to compare the statistical significance between the rates of extubation failure in the two tests? <> context@']