For questions 8-18, refer to the following information: Cortical thickness of the tibia is a useful measure of bone health in children with pediatric renal disease. A preliminary study of cortical thickness was conducted on healthy children to develop an understanding of healthy bone structure for a future study on children from a similar population who have pediatric renal disease. In doing so, the following analysis was conducted on a sample of N = 287 children who were assessed by a physician as being in tanner stages I or II. The goal of the analysis was to understand the relationship between cortical thickness and tibia length, both of which are continuous variables. Refer to the SAS Output below. Source DF Sum of Squares Mean Square F Value Pr > F Model A D F H <.0001 error b e g corrected total c r-square coeff var root mse co_thk_38 mean standard parameter estimate t value pr> It) 95% Confidence Limits Intercept 0.4968997050 0.21214643 2.34 0.0199 0.0793270917 0.9144723184 tibia_length 0.0110020378 0.00068555 I <.0001 what is the error degrees of freedom labeled a o a. b. c. d. e. cannot be determined from given information>