When making a decision about the null hypothesis using the Tukey test, what is the first step?

A) Identify the critical value.
B) Set the probability of familywise error.
C) Calculate the degrees of freedom (df) .
D) Relate the finding to the research hypothesis.

The first step in using the Tukey test is to set the level of probability of familywise error that is acceptable. This is usually denoted as alpha and is typically set at .05. This alpha level represents the maximum amount of error rate that is acceptable when making multiple comparisons. Only after this is set can one move on to identifying the critical value, calculating the degrees of freedom, and relating the findings to the research hypothesis.