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).