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.
FindLaw states Illinois is one of two states that specifically proscribe when children can be left alone, as of September 2014. In Maryland, children under the age of 8 cannot be left alone in a house. FindLaw also explains the Department of Health and Human Services has guidelines for children left at home alone, including maturity level, independence and a child's ability to follow directions.