Recently two methods, 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 the bubble method. Which test would be the best to compare the statically significance between the rates of extubation in the two tests.?
(A) Paired test (B) Chi square test (C) Student test (D) ANOVA
(B) Chi-square Test
It is a test used for qualitative data in which there is no motion of magnitude or size of the attitude. The data are classified by counting the individuals having the same characteristic of attribute.
Student t-test
It is used for quantitative data. The data has a magnitude and is normally distributed in the population (I.e. Continuous data) eg. Each individual has one measurement from a continuous spectrum or range such as body temperature, height, weight, blood pressure.
Student t-test is of three types:

Student t-test for single small sample.
Student t-test for independent samples (also called as unpaired test).
Student t-test for paired sample (paired t test).

Paired t-test
It compares the means of two paired samples (when two reading, are taken from a same group, before and after an intervention).