In a multiple regression model, which of the following is true?
group of answer choices:
o the coefficient of determination will be equal to the square of the highest correlation in the correlation matrix.
o adding variables that have a low correlation with the dependent variable will cause the r-square value to decline.
o the sum of the residuals computed for the least squares regression equation will be zero.
o the adjusted r-square might be higher or lower than the value of the r-square.