Probability Flashcards Preview

Biostatistics > Probability > Flashcards

Flashcards in Probability Deck (5)
Loading flashcards...
1
Q

Probability

A
  • a number that describes the chance of an event happening
2
Q

Pr(E) or P(E)

A
  • the probability of event “E”

- always between 0 and 1

3
Q

2 ways to think about Probability

A
  1. # of times E occurs/ # of times chance operation is repeated
  2. # of ways the event can occur/ # of possible outcomes
4
Q

Multiplication Rule

A
  • if 2 events E1 and E2 are independent, then:

Pr(E1 and E2)= Pr(E1) x Pr(E2)

5
Q

Conditional Probability

A
  • Interested in “ what is the probability that Event A happens GIVEN that event B has happened.
  • ”|” means “given”
  • Pr{E2|E1}= (Pr{E1 and E2})/(Pr{E1})