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Khi kiểm định sự khác biệt giữa hai trung bình của hai tổng thể (có phương sai bằng nhau) phân phối chuẩn mà sử dụng các mẫu độc lập với qui mô n1=20 và n2=15, bậc tự do cho tiêu chuẩn kiểm định t là:

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