ÔN TẬP
PHÂN PHỐI VÀ
KIỂM ĐỊNH THỐNG KÊ
Nội dung
•Phânphốichuẩn
•Phânphốichuẩntắc
•Phânphối t (Student)
•Phânphối F (Fisher)
•Phânphối Chi bình phương
•Ướclượng và kiểmđịnh
•Kỳvọng toán μ
•Phương sai δ2
Phân phốichuẩn
•Biếnngẫu nhiên LT X có 2 tham sốlà kỳvọng toán
họcμvà phương sai σ2sẽthuộcphânphốichuẩn
nếucóhàmmậtđộ xác suất
()
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⎥
⎦
⎤
⎢
⎣
⎡−
−=
2
2
2
1
exp
2
1
,:
σ
μ
πσ
σμ
X
Xf
Trong đó: và σ> 0
Nếubiếnngẫu nhiên X tuân theo phân phối
chuẩn, ta có thểviếtnhưsau: X~ N (μ, σ2)
∞
<
<
∞
−
X
Phân phốichuẩn
4.00.0 X
2.0
-2.0
-4.0
![Bài tập tình huống Kế toán tài chính: Tổng hợp [mới nhất]](https://cdn.tailieu.vn/images/document/thumbnail/2025/20251212/lakim0906/135x160/17761779960163.jpg)
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