The Ming Dynasty was established in 1368. It ruled from 1368 - 1644.
Answer: This is a " WORD-FOR-WORD PLAGIARISM".
Explanation: Word-for-word plagiarism is a type of plagiarism were someone copies another person's work word-for-word, without acknowledging the source it is been copied from.
The student has copied the original source word-for-word without acknowledging the source. The word been copied is "where variables are measured separately and then a mathematical model is chosen to portray the relationship among the variables". Which is the same in both version.
Though the student has used it in a different form to describe and define a different context from the main source. It is still plagiarism, because the student has copied it from the main source without acknowledgement
I believe the answer is: A social movement.
A social movement refers to a form of organized effort that aimed to address a specific social or political issues.
In general, these movement usually an effort to alleviate the suffering from a suppressed group that receive unfair treatment from the majorities.
The communist Manifesto was written by Karl Marx and by Friedrich Engels- Engels is the person you were looking for!
There is some discussion about the role of both authors in writing it, and some people suggest that Karl Marx did most of the work, with Engels having a smaller role.