# OCR MEI Statistics 1

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What does a union mean?
Means event 'A' OR 'B' OR both.
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What does an intersection mean?
AND
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If there is an event 'H', what does P(H') mean?
Probability of H not happening.
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What does P(A|B) mean?
Probability that event A happens given the event B happens.
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What does CONDITIONAL PROBABILITY mean?
This term refers to there being a condition on the probability that we're trying to find.
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How do we work out P(A|B)?
P(A -union- B)/ P(A)
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What is an independent probability?
2 events are independent if one does not affect the other. Example: To win £300 you must roll a 1 on the roulette wheel and draw an ace from a pack of cards. Rolling any other number apart from 1 does not affect the probability of drawing an ace.
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What is a mutually exclusive probability?
2 events cannot happen at the same time. Example: drawing both a club and a diamond from a pack of cards with one try (card).
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How do you determine if two events are independent?
P(A -intersect- B) = P(A) X P(B).
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How do we work out probability using tree diagrams?
We times together the branches and if we have more than 1 possible route then we add the probabilities from each route together.
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Why do we use a Stem and Leaf diagram?
To organise data into groups without losing any detail. Numbers closest to the stem are smaller.
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What is another solution to find probability?
Two-way tables.
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## Other cards in this set

### Card 2

#### Front

What does an intersection mean?

AND

### Card 3

#### Front

If there is an event 'H', what does P(H') mean?

#### Back ### Card 4

#### Front

What does P(A|B) mean?

#### Back ### Card 5

#### Front

What does CONDITIONAL PROBABILITY mean?

#### Back 