Consider the linear regression model given by = 6.553 -0.0312 x and the determination coefficient R = 0.64 . The increment in the dependent variable when the independent variable increase by one unit = Select one: a. 0.0312 b. - 0.0312 c. 6.553 d. -6.553 The range for the following set of observations - 15, - 11,-8,- 7 equal Select one: a. 8 b. - 8 c. no range for negative values a d. 3 The range for the following set of observations - 15, - 11,-8, - 7 equal Select one: a. 8 b. - 8 c. no range for negative values d. 3