Probability Distributions Flashcards
1
Q
random variable definition
A
the results of an experiment we don’t the outcome of
2
Q
how do represent random variables
A
capital letters
2
Q
discrete variable definition
A
a variable which can only take a countable number of values
3
Q
discrete uniform distribution
A
all the probabilities are the same
3
Q
what does a probability distribution show?
A
probability of any outcome in the sample space
4
Q
how can the probability distribution of a discrete random variable be displayed
A
- probability table
- probability function
- diagram
4
Q
combination equation
A
nCr
5
Q
A
5
Q
binomial distribution equation
A
P(X=r)=(n) p^r (1-p)^n-r
(r)
5
Q
conditions for a random variable to be binomially distributed
A
- fixed no. of trials (n)
- 2 possible outcomes (‘success’ and ‘failure’)
- fixed probability of success (p)
- trials are independent of each other (we mainly assume this)
5
Q
binomial distribution model
A
X~B (n,p)
6
Q
A
