Identify the correct statement(s):

a.

In simple linear regression analysis,the coefficient of determination (r square)denotes the percentage of the total variation in the dependent variable (Y)that is explained by the simple linear regression line

b.

In simple linear regression analysis,the coefficient of correlation (r)must have a value between -1and +1inclusively

c.

In simple linear regression analysis,if the coefficient of correlation (r) is -1, it means there is a perfect negative correlation between the dependent variable (Y) and the independent variable (X)

d.

All of the above statements are correct