[中學] 標準差定義?(為何用平方和開根號)
標準差定義是
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S = {[sigma(x_i - x)^2]/n}^(1/2) (離均差平方和平均再開根號)
為何不用絕對值就好?
S = [sigma|x_i - x|]/n (離均差平方和開根號再平均)
當初在定義的時候有甚麼考慮嗎?
另外第二個 S 在統計中是否有用到? ORZ
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