Indicate whether or not the following statements regarding t

Indicate whether or not the following statements regarding the correlation coefficient r are true or false:

F/T An r value of +0.65 offers stronger proof of cause and effect than does an r value of -0.50.

F/T An r=0.0 implies there is absolutely no mathemtical correlation between two variables.

F/T An r value > 0.0 implies that Y increases as X decreases.

F/T An r value > 0.0 always indicates significant correlation.

F/T When comparing correlation between two variables, use averages rather than individual values.

F/T If r > 0.5, it is permissible to extrapolate values of Y for values of X that are not in the data range of X.

F/T Only positive values of r provide evidence of cause and effect.

Solution

            True.

           It doesnot matter whether r is positive or negative. The positive and negative sign indicate possitive correlation and neagtive correlation respectively.

           True.

       False

     Negative correlation implies that Y increases as X decreases or that X increases as Y decreases.

       False

   r > 0 indicate positive correlation.

       True

       True

       False