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.
Only a handful of states legislate at which age a child can legally be left home alone: Both Maryland and North Carolina prohibit children under the age of 8 from being left alone. In Oregon, it is unlawful to leave a child under the age of 10 home alone if the length of time would endanger the health or welfare of the child. A child in Illinois may not be left home alone without supervision âfor an unreasonable period of time.â