Statistics

Question 1

What does the variance of a distribution tell us?

Answer 1

How spread the data or results are from each other.

Question 2

If a set of data has a variance of 0 , what does that suggest?

Answer 2

All values of that data are the same.

Question 3

If X is Poisson what does this mean about it’s data type , and what values can it accept?

Answer 3

Means it is discrete random so it can only take whole values.

Question 4

Equation for Poisson distribution

Answer 4

P(X=x)

Question 5

What is a discrete random variable?

Answer 5

A variable that has a distinct number of numerical values that depends on chance.

Question 6

What does the variance tell us?

Answer 6

How far out/ how much the random variables of a distribution vary from the expected value/ mean.

Question 7

What are the conditions that need to be met in order to use the Poisson distribution?

Answer 7

Events must occur randomly.
Events happen one at a time.
Events happen at a constant rate.