Find out if ANY groups in a set larger than two differ significantly from each other. As data analysts, you may have to find out if any groups in a set of 3 or more groups differ from each other. To do this, you must have measurement data and calculate the mean and standard deviation for each of the groups in the study. In one-way analysis of variance (ANOVA), you can ask three types of questions:

• Do ANY of the groups differ significantly from each other?
  The F-ratio will tell us this!
  
  
• Which specific groups differ?
  Comparison Techniques will tell us this!
  
  
• Are the differences relatively big or small?
  Measures of Explained Variance will tell us this!