Which of the following is true?

a) Regression analysis is used to measure the strength of the association between two numerical variables, while correlation analysis is used for prediction.

b) If the correlation coefficient is greater than 0.5 then the coefficient of determination, R 2 , from a simple regression model is greater than 0.25.

c) the smaller the sample size, the smaller the standard error of estimate.

d) In simple linear regression, the fit of the regression equation to the data is improved as error sum of squares increases and regression sum of squares decreases.

e) None of the above