Given that we have a set  of data and a desired level of significance 
, we want a function 
 which can be either zero or one. If the value is one then the function tells us that the sample mean of the dataset 
 is significantly different from zero, at level 
. Similarly, if we have two datasets 
 then we want a function 
 that tells us whether or not the two datasets have a significantly different mean, at level 
. …
 
									