Meaning of data

Data are things known or assumed, that means if data are something which is known or assumed. This might be about age (such as 40 years old), the supply of rice is enough. Because assumption might be true or might be false, assumption in the form of hypothesis should be examined first with the way by collecting the data first and by using the certain examining criteria or criteria test. One survey might be said as conducted in order to examine hypothesis or assumption that might be right or might be wrong. Wrong assumption could lead to wrong decision.