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Câu 72: nhận định nào sau đây là đúng về đường hồi quy mẫu ước lượng bởi OLS?A. ứng với một mẫu quan sát có duy nhất một đườngB. xét trên tổng thể, có vô số đườngC. đường hồi quy mẫu ước lượng bởi OLS của hai mẫu bất kì không nhất thiết phải giống nhauD. cả A, B và C

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