why use a student's t distribution instead of a z distribution why use z distribution instead of t distribution which distribution is a z why not use z distribution instead of t what's the difference between the z- and the t- distributions why use student's distribution why use student's t distribution instead of z distribution why use student t distribution instead of z why use z instead of t which distributions should be used for a p value? why use student's t distribution why use the z distribution why do i use student's t distribution instead of z distribution why use student's t distribution? why not do an id test with student's t distribution t distributions in maths definition what is student's q distribution why do we use student's t distribution why use student's t distribution why student's t distribution