Theoretical quantiles graph. The theoretical quantiles graph (q-q plot), used to check the normality of the data of a distribution, is reviewed.
Mean’s confidence interval. Obtaining a mean, the concept of standard error and the calculation of the mean’s confidence interval are described.
Comparisson of variables. We describe the statistical tests that should be used for comparisson of variables of different kinds.
Law of small numbers. The law of small numbers, applying binomial probability, explains the occurrence of Bernouilli events in small samples. I remember when I was a child and went to school that almost everyone had a village to go…
Probability distributions. Probability distributions frequently used, different to the normal one, are described: Student’s t, chi-square and Snédecor’s F.