TABLES 251 



TABLE IV 



Relative Cumulative Frequency Distribution op t Showing the Pro- 

 portions of All Sampling U with the Same Degrees of Freedom Which 

 Are Less Than the t Shown in Column 1 on the Left 



Degrees of Freedom 



Some Frequently Used t's Corresponding to Pre-assigned Probabilities 

 of Occurrence during Random Sampling 



Degrees of Freedom 



P(\t\> t ) 8 9 10 11 12 14 16 18 20 22 26 30 



.100 1.86 1.83 1.81 1.80 1.78 1.76 1.75 1.73 1.72 1.72 1.71 170 



.050 2.31 2.26 2.23 2.20 2.18 2.14 2.12 2.10 2.09 2.07 2.06 2 04 



.010 3.36 3.25 3.17 3.11 3.06 2.98 2.92 2.88 2.84 2.82 2.78 2 75 



.001 5.04 4.78 4.59 4.44 4.32 4.14 4.02 3.92 3.85 3.79 3.71 3 65 



