Which of one of the following statements about the correlation coefficient, orr, is correct?

1.None of the other answer options is a correct statement.

If the value ofrturns out to be -2.76, we should conclude that the relationship between the variables is extremely weak.

2.If the value ofris negative and we construct a regression equation, the slope in the regression equation will be positive.

3.A correlation ofr= 0.87 is stronger than a correlation ofr= -0.87.

4.A perfect correlation ofr= 1 means that we should conclude that one variable causes the other.