Example Find the number of pair of observations from the following data.

r = 0.25, S (x_i - x ) ( y_i - y ) = 60, s_y = 4, S ( x_i - x )2 = 90.

Solution: Given - r = 0.25

If the values of x and y are very big, the calculation becomes very tedious and if we change the variable x to u = and y to where x₀ and y₀ are the assumed means for variable x and y respectively, then r_xy = ruv

The formula for r can be simplified as

Index

6. 1 Introduction
6. 2 Correlation
6. 3 Types of Correlation
6. 4 Degrees of Correlation
6. 5 Methods of determining correlation
6. 6 Coefficients of Correlation for Bivariate Grouped Data 6. 7 Probable Error
6. 8 Rank Correlation Coefficient
6. 9 Linear Regression