At a given station, a transit was used to measure four angles, closing the horizon. The value for each angle was found several times, and a standard deviation (s) for each angle was found, as shown in...

At a given station, a transit was used to measure four angles, closing the horizon. The value for each angle was found several times, and a standard deviation (s) for each angle was found, as shown in the table below. Field measurements After the least squares adjustment of the conditional model, the a posteriori variance–covariance factor is s 2 0 = 0.586 96. a) Give the conditional model and the M matrix. b) Compute the covariance matrix of the residual vector Cv. c) Compute the variance–covariance matrix of the adjusted observations Cl .