Measures of Central Tendency and Dispersion

• Descriptive statistics


  - Numerical data used to measure and describe characteristics of groups.

  - Includes measures of central tendency and measures of dispersion.
• Measures of central tendency

  Mean, median, mode
• Mean


  Average

  
• Median


  Middle number

  
• Mode


  The value that occurs most frequently in a given data set.

  
• Measures of dispersion


  The general term for any measure of the spread or variation in a set of scores.
• Range


  The difference between the highest and lowest scores in a distribution

  
• Standard deviation


  A computed measure of how much scores vary around the mean score