Question

For a bivariate data b_yx = -1.2 and b_xy = -0.3. Find the correlation coefficient between x and y.

Answer 1

Correlation coefficient is given by

r = `+- sqrt[ b_(yx) . b_(xy) ]`

  = `+- sqrt( -1.2 xx -0.3 )`

  = `+- sqrt (0.36)`

r = - 0.6
[ ∵ both b_yx and b_xy are negative. ]