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.
Here are some things to consider when deciding if your child is old enough to be home alone without a sitter: 1  Generally speaking, a child must ne 12 years of age or older before you are legally permitted to leave him home alone for any period of time. Generally speaking, a child must ne 12 years of age or older before you are legally permitted to leave him home alone for any period of time. 2  In some states and municipalities this may be different, and before you even consider doing so, check with your local law enforcement agency to know the laws.