Answer:
A statistical question is answered by collecting variable data, to reach some conclusion.
The answer is : What type of paper are most greeting cards made with? This is statistical as for this question one will have to ask many people or many card makers.
What type of paper is the best for making greeting cards? This cannot be the answer as people can easily say one or two types.
What is the name of the day of the week after Thursday? This is not statistical as it has a universal answer, Friday.
What day of the week is it? This is also not statistical.