Question 4 3 pts A simplified version of the regression table for the model/data pictured in the preceding questions is shown below. The baseline level for dose is the placebo. What is the difference between the main effect (intercept) of the placebo group and the high dose group? Estimate Pr(>|t[) (Intercept) 1.02 0.11 doseLow 1.25 0.06 doseHigh 4.26 0.001 age 0.74 0.24 age:doseLow 0.01 0.89 age:doseHigh 0.95 0.02 O 1.25 1.02 O 3.24 O 4.26 O -0.95