BÀI GIẢNG HÓA PHÂN TÍCH TS. GVC. HOÀNG THỊ HUỆ AN
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6.4. Các đại lượng thống kê cơ bản :<br />
Giá trị trung bình<br />
Giá trị thực<br />
Độ lệch chuẩn<br />
Phương sai<br />
S<br />
σ<br />
n<br />
=<br />
n<br />
∑<br />
i=<br />
1<br />
( X<br />
i<br />
X<br />
n −1<br />
n<br />
µ =<br />
−<br />
X<br />
)<br />
=<br />
n<br />
∑<br />
1<br />
lim<br />
2<br />
=<br />
i = 1<br />
= lim s =<br />
n<br />
− > ∞<br />
n<br />
n<br />
X<br />
n<br />
X<br />
n − > ∞<br />
n<br />
∑<br />
n<br />
∑<br />
i=<br />
1<br />
(<br />
−<br />
i<br />
X<br />
X<br />
n<br />
i<br />
i<br />
n<br />
− (<br />
∑<br />
i<br />
n −1<br />
−<br />
X<br />
µ )<br />
i<br />
2<br />
)<br />
2<br />
/ n)<br />
Hệ số biến thiên<br />
CV =<br />
S<br />
X<br />
n<br />
n<br />
. 100<br />
%
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