a) There are two covariates Z1 = 1 for smoker and 0 for non smoker. Z2 = 1 for male and 0 for female. b) the parameter estimates are beta1(hat)= .05 and beta2(hat)= 015. c) the covariance parameter matrix for beta1(hat) and beta2(hat) is .0002 .0001 .0001 .0003 Determine the upper limit of the 95% confidence interval for the relative risk of a female non-smoker compared to male smoker. I want to know how variance is to be calculated. Thanks beforehand.
a11 = Cov(B1,B1) = Var (B1) a12 = Cov (B1,B2) = a21 a21 = Cov(B2,B1) = a12 a22 = Cov(B2,B2) = Var(B2)
