1. To test a new drug's effectiveness at decreasing calcium in blood platelets, doctors gave the drug to a group of 30 patients and a placebo to another group of 30 patients. Since research has shown that blood pressure is related to platelet calcium levels, they measured each patient's blood pressure (mm Hg) in addition to the calcium concentration in their blood platelets (nM). They ran two different models predicting platelet calcium: Model A contains only the main effects of Treatment and Blood Pressure, while Model B also contains the interaction term. b. Below are the results om Model A (main effects only). Note that Treatment was dummy- coded (0=Placebo, 1=Drug). Estimate Std. Error t va'lue Pr(>|t|) (Intercept) 17.678 5.749 3.075 0.003 ** b'lood_pressure 1.026 0.061 16.901