1
Q
Conditions of the trial
A
- conducting trials on random samples of a certain size, denoted by n
- two possible outcomes (success, denoted by p, and failure, denoted by q)
- both outcomes have fixed probabilities, the two adding to 1, so p + q = 1
- P(success) is independent of previous trials
2
Q
The expectation of B(n, p)
A
Mean can be calculated by:
- multiplying each probability by the total to get the frequency
- multiplying each frequency by the number of successes
- Adding these numbers together
- Dividing by the total
3
Q
nPr
A
When order DOES matter, so for e.g. GSG is different to GGS and SGG; = n!/(n-r)!
4
Q
nCr
A
When order DOESN’T matter, so for e.g. GSG is the same as GGS and SGG; = n!/r!(n-r)!
