Consider the Moderna COVID-19 vaccine RCT study, which reported that over the 4 months after getting the shot (either the vaccine or a placebo), 11 of 14,550 vaccine recipients and 185 of the 14,598 placebo recipients had contracted COVID-19. Suppose you get access to the trial data and you run a regression, Yi = b0 + b1 Xi + i , where Yi is a binary variable which is 1 if subject i contracted COVID-19 and 0 otherwise, and Xi is a binary variable which is 1 if the subject i received the vaccine and 0 if she received the placebo. (a) (2) What is the estimate and interpretation of b0? (b) (2) What is the estimate and interpretation of b1