What does the variance of a distribution tell us?
How spread the data or results are from each other.
If a set of data has a variance of 0 , what does that suggest?
All values of that data are the same.
If X is Poisson what does this mean about it’s data type , and what values can it accept?
Means it is discrete random so it can only take whole values.
Equation for Poisson distribution
P(X=x)
What is a discrete random variable?
A variable that has a distinct number of numerical values that depends on chance.
What does the variance tell us?
How far out/ how much the random variables of a distribution vary from the expected value/ mean.
What are the conditions that need to be met in order to use the Poisson distribution?
Events must occur randomly and independently.
Events don’t happen at the same time.
Events happen at a constant rate.
What does the passion distribution model?
The Poisson distribution models how often an event occurs in a certain time or space.
