RANGE

• WHAT ARE THE MEASURES OF DISPERSION?

  range, standard deviation
• WHAT DOES THE RANGE TELL YOU?

  spread of data
• LEVEL OF MEASUREMENT OF RANGE?

  ordinal
• STRENGTHS OF RANGE?

  • easy and simple to calculate
  • used for ordinal data where mean is unsuitable
• WEAKNESSES OF RANGE?

  • only takes into account two most extreme values
  • unrepresentative of data as a whole
  • does not indicate if numbers closely grouped around mean/ spread out
  • easily distorted by extreme scores
• WHAT DO HIGHER MEASURES OF DISPERSION MEAN?

  more individual differences