2.6 According to a report by the United Nations Office on Drugs and Crime, the number of homicides involving firearms per million people is about 62.4 in the United States, 6.0 in Canada, 5.6 in Australia, and 1.3 in the UK. Use the relative risk to compare the United States with the other countries. For such data, explain why the relative risk is more informative than the difference of proportions.