例句與造句

1. Information such as : estimation, sufficiency and properties of variances of estimators.
2. Randomization also produces blocking and experiments that have hard-to-change factors; additional restrictions on randomization can occur when a full randomization is infeasible or when it is desirable to reduce the variance of estimators of selected effects.
3. It's difficult to find variance of estimator in a sentence. 用variance of estimator造句挺難的