Question

1. instead of r^2 what other tool can be used to assess the reliabilty of our results?

Answer 1

If R^2 = 1, There is a relation between dependent and independent variables

or 100% Variation in Y variable is explained by variation in X variable

If R^2 = 0, There is no relation between dependent and independent variables

or 0% Variation in Y variable is explained by variation in X variable

Same as results of F test (P value) in regression output gives the relation between dependent and independent variables

and also r value gives the relaibilty of the test

If i t is nearer to 1, excelent (strength)

If i t is nearer to 0, week (strength)

r value is either positive or negative (direction)