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Cần kiểm định giả thuyết: "Mức giá trung bình đã vượt trên 120 (nghìn)", với giá phân phối Chuẩn.Điều tra mẫu kích thước 100 được trung bình mẫu là 122, phương sai mẫu là 10.Khi đó giá trị quan sát là:
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