When Thursday Night Football is over, Big Bang and Life in Pieces will be followed by Mom and new comedy Angel From Hell and Elementary. Person of Interest, which did not get a full 22-episode order, will be held for midseason, as are 2 Broke Girls, Mike and Molly and The Odd Couple.
In statistics there are two kinds of means: population mean and sample mean. A population mean is the true mean of the entire population of the data set while a sample mean is the mean of a small sample of the population.
A parameter is any number calculated from a population. A statistic is any number calculated from a sample. It is important to remember that we are often concerned about the population and the calculated parameters associated with that population. However, we usually do not know or can not obtain these values, so we rely on sampling and statistics to provide us with inferences about the population.