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Cần kiểm định giả thuyết "Độ phân tán của chi tiêu là chưa đến 8 (triệu2)", với chi tiêu phân phối Chuẩn.Điều tra mẫu kích thước 50 được trung bình mẫu 30 và phương sai mẫu là 5 (triệu2).
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