16.2 ) Conditional probability Flashcards

(10 cards)

1
Q

What does P(A|B) mean ?

A

What is the probability of A given that B has happened

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2
Q

What does P(AnB) mean ?

A
  • Intersection of A and B
  • What is the probability both A and B happen
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3
Q

What does P(AuB) mean ?

A
  • Union of A and B
  • What is the probability either A happens, or B happens or both happen
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4
Q

What does P(A’) mean ?

A
  • Complement of A
  • What is the probability that everything could happen other than A
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5
Q

What is the equation for P(AuB) ?

A

P(AuB) = P(A) + P(B) - P(AnB)

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6
Q

What is the equation for P(A|B) ?

A

P(A|B) = P(AnB) / P(B)

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7
Q

Do you know how to use / draw two way tables ?

A
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8
Q

How do we rearrange the formula for p(A|B) for tree diagrams ?

A
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9
Q

Do you know how to use and draw tree diagrams ?

A
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10
Q

How do you check if events are indepdnat ?

A
  • If P(AnB) = P(A) x P(B) INDEPENDANT
  • IF NOT, THEN NO
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