Passage Summary: Just because a large group of people has some members who lack a certain title, the speaker assumes that a smaller group chosen from that large group must also have members who lack that title.

Conclusion: It is certain that not every member of the linguistics department is a full professor.

Reasoning: The argument assumes that because the general group of tenured faculty includes some people who are not full professors, any specific sub-group of tenured faculty (like the linguistics department) must also include some people who are not full professors.

Analysis: This argument commits a flaw of distribution, specifically assuming that a characteristic of a general class must be present in every specific subset of that class. While it is true that 'not all' tenured faculty are full professors, it is entirely possible that the linguistics department happens to be composed exclusively of the tenured faculty who *are* full professors. To find the parallel, look for an answer that takes a general 'some are not' or 'not all' statement and incorrectly forces that diversity onto a specific, smaller group. It's like saying because not all cars are red, the cars in this specific parking lot cannot all be red.