116 STATISTICAL METHODS. 



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I. FORMULAS. 



. = 0.6745^=. x = V-A 



V n 



.=L =0.7979*7. W -0.6745*. 



n ^4. D. 



2(J) , Jl&J) , _7_t 

 n t 2n 240 * 



= D = o.A. 



4(402- 30i)(2& * 3ft-6) 



|| (Types I, IV). a== p~ 3 C^ 6 V >- 



0.6745o ( TT (1-a 2 ) /, , X 2 \ )t 

 Probable discrepancy, - j . 3 - ( 1 + ^ } V 3 . 



r _ J(dev. x X dev. y X /) = ^(xiX 2 /) ^ ^0.6745(l-r 2 ) 



n. 01.02 noia-2 \/~n 



r (spurious correlation) = 



02 o 2 03 



, 6745oi A / 1 ri 2 2 



h ~ o 2 n 



To solve any equation of the second degree, 



-bVb 2 -4ac 

 2a 



