a) This semester, we have discussed the method of moments and maximum likelihood as methods for proposing estimators. i) What is meant by "proposing an estimator"? ii) Choose either one of the previous methods, and briefly/succinctly explain how it is used to propose an estimator. b) This semester, we have discussed bias, mean squared error, consistency, and sufficiency as properties of estimators. i) What is meant by "properties of estimators"? ii) Choose any two of the aforementioned properties, and briefly/succinctly explain how they are used to assess an estimator.