If I search in the internet, I find "hypothesis" is a singular word as I see "is" after it. But I found the following line in the book "Naked Statistics: Stripping the Dread from the Data" by Charles Wheelan (in CHAPTER 9) -
if the null hypothesis were true and this were really a bus full of Changing Lives passengers;
Why "were" is used after "hypothesis"? Should not it be "hypothesis was true"?