It revealed that the product of the standard deviation of the estimated sampling variance and square root of the number of samples was a constant.

实验也证明，取样方差估计值的标准偏差与样本数目的平方根之积可近似为一常数。

youdao

It's a free online service that gives users the estimated value of a home, along with maps, aerial photos and a price sampling for other homes in the area.

NPR: Web Site Offers One Stop for Real Estate Data