Here are some of the questions that need to be answered when choosing the appropriate inferential procedure:
. Are you comparing groups or sets of scores? Are you correlating variables?
. What is the level of measurement of the variables (nominal, ordinal, or interval/ratio)?
. How large are the groups (sample size)?
How many groups or sets of scores are being compared?
. Are the observations or scores dependent or independent?
. How many observations are available for each group?