Chapter 2 Conditional Probability - Year 2 Flashcards
What is the symbol for the universal set?
Draw the venn diagram of A’?
Explain what A or B means in greater detail than year 1?
The elements that are in set A + elements of set B - any repeats
What else do you need to know in order to be able to work out A’?
You need to know what is in the universal set
What does mutually exclusive mean?
The events can’t happen simultaneously
What does mutually exclusive mena in terms of equations?
What does independent mean?
When event A doesn’t effect event B
What is the complicated version of P(AorB)
P(AorB)=P(A)+P(B)-P(AandB)
How do you calculate P(AandB) when the events are:
Mutually exclusive
Independent
Dependent
What is the conditional probability formula?
What do you always forget to do when drawing a venn diagram?
I forget to write the probability not in the circles
What took me a long time to get?
When it is an “and” it needs to fulfil both criteria
What is it always useful to remember when working out probability?
Remember to subtract any repeated ata when working out an “or” probability
If there is a question about medicine what is likely that part c and d will be, give an answers?
C) find the probability that given someone has tested positive for the disease find the probability that they don’t have a disease
D) comment on the usefulness of this test
Answer to c will often include an answer which has been previously worked out
D)there is a high or low chance of false positive results so it is accurate/high chance of false positives
