• Measures of central tendency tell us about the scores that are most typical of a data set.
  
  
• The mean, median, and mode are the most widely used measures of central tendency.
  
  
• Measures of variability tell us how spread out, or dispersed, the scores are in a data set.
  
  
• The range and standard deviation are the most widely used measures of central tendency.
  
  
• The mean and standard deviation are usually used together. They tell us the center point of the data set and the average distance of each score from the center point.
  
  
• The median and range are usually used together. The median tells us the middle score, and the range tells us the distance between the lowest and highest score.

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