Thisbook provides an introduction to elementary probabilityand to Bayesian statistics usingde Finetti's subjectivist approach. One of the features of this approach is that it does not require theintroduction ofsample space a non-intrinsic concept that makes the treatment of elementary probability unnecessarily complex but introduces as fundamental the concept of random numbers directly related to itsinterpretation in applications. Events become a particular case of randomnumbers and probability a particular case of expectation when it isapplied to events. The subjective evaluation of...