The United Nations Statistical Office recently released data on the rate of illiteracy for men and women aged at least 15 years in many developing nations. A scatterplot of these data for 85 countries in Africa, Asia, and the Middle East appears below. The line on this plot is the least-squares regression line for predicting female illiteracy rate from male illiteracy rate. The equation of this line is female rate = 7.66 + 1.32 male rate.