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                            ![](https://img.kancloud.cn/d4/84/d4848b67e12e3db98448023919c64b01_45x68.png)是樣本容量的標準誤差，樣本越大，標準誤差越小，樣本均值的抽樣分布變異性越小，總體均值估計越準確。
![](https://img.kancloud.cn/d5/a1/d5a16b0b4b2a170293ef83edad6fcdb4_1532x809.png)
*****
總體標準差未知，用初始樣本的標準差作為![](https://img.kancloud.cn/05/5a/055af191d6ba35b8c55b28cb690914f6_31x19.png)的計劃值
![](https://img.kancloud.cn/2d/70/2d70093296958db8ba2910b2a2336502_1517x828.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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