The regression lines will be perpendicular to each other if the coefficient of correlation r is equal to

The value of r when the regression lines are perpendicular to each other is:

Find out the correct answer out of the options given against each questions : If the two regression lines are mutually perpendicular to each other, then r is equal to

The two line of regression are perpendicular if

If the line of regression coincide, then the coefficient of correlation is

If the line of regression are parallel to the coordinate axis, then the coefficient of correlation is

If the two regression coefficients are - 0.4 and -1.6, then the coefficient of correlations is

Pair of straight lines perpendicular to each other are represented by

Pair of straight lines perpendicular to each other are represented by