Computers and Technology

Thế nào là một ước lượng hiệu quả? Cho X1,X2,... là một mẫu ngẫu nhiên có cỡ mẫu n(n>30) từ một tổng thể với E(X)=μ và phương sai D(X)= σ^2 (x_1+x_2+x_3)/3 và tổng x là những ước lượng không lệch hay có lệch của μ
Ước lượng nào ở câu a là ước lượng hiệu quả
Xây dựng khoảng ước lượng đối xứng cho trung bình tổng thể

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Thế nào là một ước lượng hiệu quả? Cho X1,X2,... là một mẫu ngẫu nhiên có cỡ mẫu n(n>30) từ một t...

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