x y Xi-Xu Yi-Yu prodotto (Xi-Xu)² (Yi-Yu)² Ŷi ^ei=Yi-Ŷi ^ei² (Yi-Ӯ)²
126 200 1,20 10,00- 12- 1,44 100 225,26 25,260- 638,07 100
238 400 13,20 190,00 2.508 174,24 36.100 377,90 22,100 488,41 36.100
316 80 8,80- 130,00- 1.144 77,44 16.900 98,06 18,060- 326,16 16.900
424 120 0,80- 90,00- 72 0,64 8.100 199,82 79,820- 6.371,23 8.100
520 250 4,80- 40,00 192- 23,04 1.600 148,94 101,060 10.213,12 1.600
tot 124 1.050 - - 3.520 276,80 62.800 1.049,98 0,02 18.037 62.800
Xu= 24,80
Yu= 210 oxy= 704
ox²= 55,36
oy²= 12560
corr(x,y,)= 704 / 7,44 * 112,07 = 0,844