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Cần kiểm định giả thuyết "Độ phân tán của chi phí là khác 5 (triệu)", với chi phí phân phối Chuẩn.Điều tra mẫu kích thước 50 được trung bình mẫu 30 và độ lệch chuẩn mẫu là 7 (triệu).Khi đó giá trị quan sát là:
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