. Scholars of political development have investigated the so-called "oil curse," the idea that oil-rich countries tend not to develop democratic systems of governance. Consider the following data, which present information for 20 countries with non-oil-dependent economies and 15 countries with oil dependent economies. The dependent variable is a 7-point-scale with higher scores denoting more democracy. Here are the mean values, standard deviations, and number of observations for the two groups.

Oil-dependenteconomy? Mean democracy scale Standard deviation Number of observations

yes 4.6 1.859 15

no 2.6 1.252 20

A. What is the null hypothesis? B. What is the alternative hypothesis? C. What is the t value? (Be sure to show your work) D. Using your table, can you reject the null hypothesis at the 0.05 level?