Which one of the following is true?

a. In a linear regression model, testing whether the slope of the population regression line could be zero is the same as testing whether or not the population coefficient of correlation equals zero.

b. The area under the normal curve outside -1.5 to 1.5 is 0.1336

c. If you double each entry on a set of data values, that doubles the variance.

d. If the coefficient of determination is 1.0, then the coefficient of correlation must be 1.0.

e. None of the suggested answers are correct