A small number of statistical procedures are sufficient to test most of the research hypotheses that you might encounter. This section will cover these basic procedures, which share in common the fact that they compare the means of distributions.

These are by no means the only inferential statistics that are
available to researchers, but they are by far the most widely used.
You can go directly to one of these procedures by clicking on the
name of the test in the *Table of Contents* below. However, if
you are new to the logic of statistical analyses, we recommend that
you cover these procedures in the order that they appear. The reason
is that each procedure introduces a different aspect of the logic of
inferential statistics.