[d] [5 points) The mean CC for democratic countries equals [1.38 and the standard deviation equals 0.99. In contrast, for non-democratic countries the mean CC equals -[l.6 and the standard deviation equals 0.72. Test whether there is a statistically signicant difference in the CC measure between democratic and non-democratic countries. (IMPORTANT: Use the ruleof-thumh approach used in class to make this test. In order to get full marks, you need to show your work.)