This tool calculates the z score of the mean of a single sample. It can be used
to make a judgement about whether the sample differs significantly on some axis
from the population from which it was originally drawn.
By default, this tool works on the assumption that you already know the mean value
of your sample scores and the number of individuals in your sample. If you want
the tool to calculate these for you from raw values, please select the checkbox
Note: To use this tool, you've got to know the mean of the population from which
the sample is drawn (i.e., the population mean) and its variance (which is its standard
deviation squared). There's no way around that!