This flowchart will make sure you choose the correct test.











 

Is this question discussing proportions?

 

1 sample T test




YES


NO



YES

1 proportion Z test
 YES

For proportions.
Do I have 1 sample?

 

For the mean!
Do I know the population standard deviation?
 NO

T test.
1 sample?



NO




YES


NO



2 proportion Z test

 

Z test.
1 sample?


2 sample T test






YES

NO




 

1 sample Z test


2 sample Z test

 










 
 
 
 










 
 
 
 










 
 
 
 








