Conditional probability. Sometimes the initial probability can change if we have certain information. This is what is called conditional probability.
Combinatory and probability. An example of the use of combinatory is presented to obtain the possible and total events to calculate the probability of that event.
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.