Calculate the correlation coefficient from the following data
N = 9, ΣX = 45, ΣY = 108, ΣX² = 285, ΣY² = 1356, ΣXY = 597

Calculate the coefficient of correlation between X and Y series from the following data.

Description	X	Y
Number of pairs of observation	15	15
Arithmetic mean	25	18
Standard deviation	3.01	3.03
Sum of squares of deviation from the arithmetic mean	136	138

Summation of product deviations of X and Y series from their respective arithmetic means is 122.

Obtain the two regression lines from the following data N = 20, ΣX = 80, ΣY = 40, ΣX² = 1680, ΣY² = 320 and ΣXY = 480

Calculate the coefficient of correlation from the following data:
ΣX = 50, ΣY = –30, ΣX² = 290, ΣY² = 300, ΣXY = –115, N = 10

Calculate the correlation coefficient from the following data:
ΣX = 125, ΣY = 100, ΣX² = 650, ΣY² = 436, ΣXY = 520, N = 25