OCR MEI Statistics 1

What does a union mean?
Means event 'A' OR 'B' OR both.
1 of 12
What does an intersection mean?
AND
2 of 12
If there is an event 'H', what does P(H') mean?
Probability of H not happening.
3 of 12
What does P(A|B) mean?
Probability that event A happens given the event B happens.
4 of 12
What does CONDITIONAL PROBABILITY mean?
This term refers to there being a condition on the probability that we're trying to find.
5 of 12
How do we work out P(A|B)?
P(A -union- B)/ P(A)
6 of 12
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.
7 of 12
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).
8 of 12
How do you determine if two events are independent?
P(A -intersect- B) = P(A) X P(B).
9 of 12
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.
10 of 12
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.
11 of 12
What is another solution to find probability?
Two-way tables.
12 of 12

Other cards in this set

Card 2

Front

What does an intersection mean?

Back

AND

Card 3

Front

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

Back

Preview of the front of card 3

Card 4

Front

What does P(A|B) mean?

Back

Preview of the front of card 4

Card 5

Front

What does CONDITIONAL PROBABILITY mean?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Statistics resources:

See all Statistics resources »See all Probability resources »