Choose the incorrect statement below. A. X is an estimator for and S2 is an estimator of 2. B. Population parameters are generally, in practice, unknown quantities which are estimated by sample statistics. C. Sample statistics are generally unknown quantities which are estimated by finding population parameters. D. Given two random variables, X and Y, when both the covariance and correlation coefficient of a distribution equals zero, then X and Y could be independent. E. The two moments, and 2, of a distribution are examples of population parameters..