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.
Georgia, Illiniois, Maryland and Oregon are a few of the states with specific ages mentioned in their laws. Georgia law makes it pretty clear. Between the ages of 9 and 12, you can leave a child alone for up to two hours. - NBC Augusta.com 12 years of age appears to be the most common recommendation.