QUESTION 6 Which of the following is NOT true regarding R2 (R-squared)? 0 R2 (R squared) is a unit free measure 0 R2 (R squared) is low when explained variation (SSR) is small relative to total variation (SST) 0 R2 (R squared) is high when explained variation (SSR) is large relative to total variation (SST) 0 R2 (R squared) is a measure of statistical significance