the population mean or proportion. The true mean or proportion for the population exists and is a fixed number, but we don’t know it! Using sample statistics we get an estimate of where we expect the population parameter to be.
.d o c in .c o m 2 If you increase the sample size (n), you decrease the size of your “net” (or your margin of error). If you increase your confidence level (C), then you increase the size of your “net” (or your margin of error). A smaller “net” is good because ...