Which of the following statements is true?

a.

The strength of the correlation between two variables depends on the sign of the coefficient of correlation.

b.

If the coefficient of determination is 0.64, the correlation coefficient must be 0.80.

c.

Thet-test for the true slope1=0is identical to the t-test for the true correlation=0

only for large samples.

d.

None of the suggested answers are correct

e.

An indication of a nonlinear relationship between two variables would be a coefficient of correlation equal to zero.