Dispersion

• What are the two measures of dispersion?

  Range and standard deviation
• How do we calculate range?

  Taking lowest value from the highest value and adding one
• What is a strength of the range?

  Easy to calculate
• What is a limitation of the range?

  Only takes two most extreme values into account
• What is standard deviation?

  A value that tells us how far scores move away from the mean
• What happens the larger the standard deviation?

  The greater the dispersion
• What happens the lower the standard deviation?

  The lesser the dispersion
• Why is standard deviation a more precise measure of dispersion than the range?

  Includes all values