Which of the following is positive and which is normative?
(a) It is in the long-term interest of the UK to remain in the EU.;
(b) Will exit from the EU reduce UK growth rates?

a) Asserts an opinion without any supporting theory. It is, therefore, a normative statement.

(b) In contrast, this asks a question that can be answered using economic theory. It is, therefore, a positive statement.