The precis paragraph refers to the population question being an important area of study of sociology but nothing more than that.
So in my opinion sociology has to be mentioned in precis but has no relevance to the actual title that one opts for. Secondly, a title is primarily concerned with what the reader is reading. Therefore, inorder to suggest a suitable title the reader must question himself "What am i reading about ? ". This method will allow him to come up with a suitable title.
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