Probability

Probability

1. Basic concepts

   • Outcomes
     • The giving results
   • Sample Space
     • It's the space with all the posible results that can come out of the event
   • Event
     • The problematic that asks for this probability
   • Experiments
     • The experimentation to ensure the outcome

2. Odds

   • Numerical expression, always consisting of a pair of numbers

3. Probability Formulas

   • Theoretical Probability Formula
     • P(E)=(#ResultadosFavorables) ------------------------------ (#TotalDeResultados)
   • Empirical Probability Formula
     • P(E)=(#VecesQueOcurrioElProblema) ---------------------------------------------- (#VecesQueSeRealizoElExperimento)

4. Event involving "not" and "or"

   • Is applicable in the case where you want to find the probability of a collection of different outcomes.

5. Events involving "and"

   • Independient Variables
     • Two events are independent if the occurrence of one does not change the probability of the other occurring.
   • Dependent Variable
     • If the occurrence of one event does affect the probability of the other occurring, then the events are dependent.
   • Conditional Variable
     • The probability of event B occurring that event A has already occurred is read "the probability of B given A" and is written: P (AlB)

6. Set Operations

   • Union
     • When A, B and AnB form part of the answers
   • Difference
     • when only A without B or AnB form part of the answers
   • Intersection
     • Only AnB, the intersection that appear in both spaces
   • Complement
     • It's all the other answers that are not A and B