Question

In order to find the coefficient of correlation between two variables X and Y from 7 pairs of observations, the following results are given:

ΣΧ = 220, ΣΥ = 47.56, ΣΧΥ = 1584.98, ΣΧ = 7888, ΣΥ^2= 341.1628.

Later it was found that one particular set of observations, namely X= 34, Y=4.25 was wrongly taken, the correct values being X= 24, Y= 6.25. Compute and interpret the correct value of the coefficient of correlation.​

Answer 1

Answer:

1 - tan²(PI/4 - Theeta)/1+tan²(PI/4 - Theeta) = Sin 2 theeta