There are various types of tests that can be used in experimental designs. If an analysis indicates there may be interesting information that was not targeted for analysis in the preplanned tests, then the Tukey honestly significant difference (HSD) test is very valuable. Using this type of post hoc test, a researcher can further analyze the results after the data have been collected and initial analyses run.
The Tukey HSD test is a post hoc test used when there are equal numbers of subjects contained in each group for which pairwise comparisons of the data are being made. Post hoc tests, like this one, literally mean after the fact. They are used to determine whether any group or set of treatment conditions significantly ...
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