Trouble getting Ho/Ha right in hypothesis questions hypothesis, actually, contrary, question

siavosh

I have come across a few hypothesis questions where the QBank answer actually did not assume the contrary to the fact being tested. Such as in:
“A bottler of iced tea wishes to ensure that an average of 16 ounces of tea is in each bottle…” (Schweser question ID 22960)
What is wrong with assuming Ho:=mean NOT equal to 16 and Ha:= mean IS equal to 16?
Is Schweser just plain wrong or am I getting my head mixed up?