MS-Word strikes again: In the following test, it has green underlined the phrase "number who have" and suggested either:
- numbers who have
- number who has
Here is what I've written (slightly paraphrased for you non-statistics experts
So if you want to find Probability that "a subject tests positive" or "subject uses" by adding the column and row totals, you have counted the 44 people in the top left twice. So, to get the correct number who have tested positive or used drugs, you have to subtract the ones you counted twice. The total number of subjects who use or have tested positive is 50+134-44=140 (same number as before).
See, there's only one number: the number of people who test positive or used drugs. So clearly the first choice above is wrong.
The second choice just sounds plain wrong (but I can't put my finger on it).
Who's right? Me or MS-Word's fine grammarian?