I read this sentence earlier, and it struck me as incorrect:
A number of parameters is associated with an open connection.
My first thought was the is should be an are, but talked myself out of that because number is singular. Then I asked my wife (family grammarian), and she says that the sentence is incorrect; it should read as follows:
A number of parameters are associated with an open connection.
We checked out some examples using an online dictionary, and it seems she may be correct. What's the answer - which is correct?