1.2 Flashcards
What is conditional probability?
This is the probability of an event that is based on the probability of another event.
What is a contingency table?
A method of organizing the data that is given in order to conveniently answer the questions with fewer calculations.
What is the difference between “given” and an intersection?
For an intersection, the goal is to look at elements that are present in both events A and B without restricting the sample space. However, for a condition, we look at the probability of A occurring after having restricted the sample space to just the probability of B.
What is a tree diagram?
A method of depicting the relationships of the probability that is taking place.
How do you start to make a tree diagram?
Look at the condition say B and the initial circles to the tree diagram must be B and B^c.
How do you start a contingency table?
Start by writing the column and row totals as well as the n(S)/P(S) in the bottom right-hand corner as everything will add up to these totals.
What is independence?
When the occurrence of event A does not have an impact on event B taking place.
What is the difference between independence and mutual exclusivity?
For mutual exclusivity the P(A n B) = 0 thus the events do not overlap or intersect, but for independence, the occurrence of one event taking place does not impact the occurrence of another event taking place thus P(A n B) = P(A) * P(B).
