Statistical Power. The Statistical Data Analysis tutorial page provides a good background for understanding the concept of statistical power. In very basic terms, statistical power is the likelihood of achieving statistical significance, when in fact the alternative hypothesis is true.
In 2001, the U.S. Census Bureau estimated that nearly 7 million school-age children are routinely left home alone. âDevelopmentally, children are generally ready to be home alone around the age of 12 or 13,â says Cherie Sage, State Director of Safe Kids Kansas.
Legal Age for Children to Stay Home Alone: Guidelines . Most states do not actually have an official legal age for children to stay home alone. Only a few have set legal guidelines: Georgia - 9 ; Illinois - 14 ; Maryland - 8 ; Oregon - 10 ; However, many states have guidelines officially listed and encouraged by various child protective agencies: