Political Analysis: Sample or Census? Sample statistics or population parameter? Regression analysis?

I’m trying to learn for my Political Science class and I’m stuck. Can you help?

Two researchers are interested in exploring the circumstances under which poverty will decline. The first scholar has a hunch that democracies are more likely to carry out policies that reduce poverty—after all, she explains, to win power in a democracy politicians have to appeal to a wider range of voters and not just high-income groups. The other scholar has a hunch that poverty is likely to decline in any country that is experiencing economic growth. They decide to collaborate on a research project testing both of their theories, using an available dataset that includes all the countries in the world. Regime-type in this dataset is classified as either democratic, authoritarian, or semi-authoritarian.

a) Are they taking a sample or a census? Explain. 5 points

b) Will the summary numbers their research yields be sample statistics or population parameters? Explain. 5 points

c) The researchers would like to use regression analysis. Will this be appropriate? Explain. 5 points