In situations where the size of the sample data set is relatively small, animed aniflex complete to assume a normal distribution.some uncertainties exist.A mistake is to use random sampling and the other the small sample size.That is why, beginning with the story pentair hose of the generalities that solved the problem t distribution, then about topics that support, and ?nally, a detailed analysis with some relationships with other distributions.
While ignore the importance for hypothesis testing in statistical inference when means were contrasted.