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
