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Cần kiểm định giả thuyết "Độ biến động của chi tiêu đã nhiều hơn mức 4 (triệu2)", với chi tiêu phân phối Chuẩn.Điều tra mẫu kích thước 100 được trung bình mẫu 30 và phương sai mẫu là 9 (triệu2).Khi đó giá trị quan sát là:
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