Question

Calculate coeffcient of correlation between marks in Mathematics and marks in Economics obtained by 10 students.

Answer 1

`gamma=(NSigmaXY-(SigmaX)(SigmaY))/(sqrt(NSigmaX^(2)-(SigmaX)^(2))sqrt(NSigmaY^(2)-(SigmaY)^(2)))`
`=((10xx1459)-(105xx117))/(sqrt((10xx1475)-(105)^(2))sqrt((10xx1521)-(117)^(2)))`
`=(14590-12285)/(sqrt(14750-11025)sqrt(15210-13689))`
`(2305)/(sqrt(3725)sqrt(1521))=(2305)/(sqrt(3725xx1521))`
`=(2305)/(sqrt(5665725))=(2305)/(2380.27)=+0.97`