D. regression analysis: avg. tot. score versus %takers, t/s ratio model summary s r-sar-sq (adj) 79. 06% r-sg (pzed) 76.83% coefficients term constant 1118.5 %takers -2.547 0.187-13.62 0.000 1.05 t/s ratio 3.73 39.5 28.34 0.000 2.21 11. what are the degrees of freedom associated with the t tests ofthe slopes? briefly explain your answer a. 46 b. 47 c. 48 d. 49 e-50 12. under what conditions are the computed p-values for these tests valid? 13. assuming those conditions are satisfied, which of the following gives a correct interpretation of the p-value of t/s ratio in model d? а b. c. at the 10% significancelevel, tsratiois a significant linear predictor in combination with %takers. atthe 5% significancelevel, t/s ratio is not a significant linear predictor in combination with %takers. both a and b