Are.
per my instinct and [link]
'The Train Job'
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I would say multitude is.
In medical writing, "data" is a plural noun, so it takes "are". I don't know what the accepted standard is in nonmedical writing. Even on NPR I hear them say "data is."
For a contrary opinion
"multitude of data that is"
14,400,000 Google results
"multitude of data that are"
10 Google results
My ear likes is too. Not An Editor!
Hmmmm. Well, so far the professor hasn't dinged me on grammar issues and there are arguments for both sides, so I think I'll run with is.
Thank you. Four pages of twelve done.
Go Suzi Go!
You're modifying multitude (is), not data (are).
I'm at 8 pages or 2/3rd done.
It is SLOW going due to the need to research and cite corroborating peer reviewed articles. Thankfully I have a student PMI membership and can access their library in addition to the school library.
I have 5 hours to do at least 4 more pages. Ok, 4.5 so I can take a dinner break. I'm also trying to take a 5 minute internet break and a 5 minute leave my desk break each hour.
Data is vs. data are is a perennial debate, at least when I've used it. The scientists like "data are"...well, the editors who edit the scientists like making it plural. But it's really a tossup.
Go Suzi! Write, write like the wind!