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.
Once the child hits 16, they can be left alone for up to two nights in a row. Mique's printable chart also breaks down laws by state. Illinois, for instance, doesn't allow children to be left home alone until they're 14. While she hopes her chart is helpful, she encourages parents to also contact their local authorities for more town-specific age restrictions.