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.
Missouri currently has no law that states a minimum age. Georgia, Illiniois, Maryland and Oregon are a few of the states with very specific ages. Typically 8 year olds and over can be left at home for up to several hours (usually after school before a parent gets home from work). 12 years old appears to be the most common recommendation. http://www.latchkey-kids.com/latchkey-kids-age-limits.htm provides a state by state comparison.