GUATEMALA CITY - Torrential rains brought by the first tropical storm of the 2010 season pounded Central America and southern Mexico, triggering deadly landslides. The death toll stood at 15 Sunday but authorities said the number could rise.
Archimedes proved the formula for the area of a circle (A = Ï r 2, where r is the radius of the circle) and showed that the value of Ï lay between 3 + 1/7 (approximately 3.1429) and 3 + 10/71 (approximately 3.1408).
As a summary of some topics that may have been overlooked in class, here are a few interesting facts about R-square related concepts. R-squared, often called the coefficient of determination, is defined as the ratio of the sum of squares explained by a regression model and the total sum of squares around the mean.