ABSTRACT
Statistical Guide: The standard error of the mean is a margin of error that takes account of random sampling error. For example, suppose the mean for a group is 10.00 and its standard error is 1.00. Then, we can have about 68% confidence that the true mean lies between 9.00 and 11.00. (Remember that we are not certain what the true mean is because we have sampled.) Thus, for this example, the limits of the 68% confidence interval are 9.00 and 11.00.
