<p>设总体X的均值μ及方差σ2都存在，且有σ2＞0，但μ，σ2均未知，又设X1，X2，…，Xn是来自总体x的样本，<img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/4b/2b/4b2be7fe46fa590ca2bfdc58e494af58.jpg" style="width: 100%;height: auto;">是μ，σ2的矩估计量，则有()<img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/04/1b/041b9328f48f218762885b9b7b99ad05.jpg" style="width: 100%;height: auto;"></p>