Final answer:
The statements are categorized as positive or normative based on whether they describe the world as it is or express opinions about how the world should be.
Step-by-step explanation:
a) The statement "The unemployment rate in 2009 was higher than it was in 2006" is a positive statement because it can be tested and proven true or false by comparing the unemployment rates in those years.
b) The statement "The price of oil should be increased because burning it has a negative impact on the environment" is a normative statement because it expresses an opinion about how the world should be, based on values and judgments.
c) The statement "Economics courses ought to increase the amount of positive content they cover" is a normative statement because it expresses an opinion about what should be taught in economics courses.
d) The statement "The unemployment rate in 2006 was higher than it was in 2009" is a normative statement because it expresses an opinion about the relative unemployment rates in those years.
e) The statement "It is right for the government to continue to financially support third world countries through foreign aid programs" is a normative statement because it expresses an opinion about what is morally right.
f) The statement "If a company pays closer attention to its opportunity costs, this should result in higher profits" is a positive statement because it suggests a cause-and-effect relationship that can be tested and proven true or false.