Graphs

• Normal distribution

  • Mean, median and mode occupy the same mid-point of the curve
  • Values are equal
  • The tails of the curve extend outwards and do not touch the horizontal x-axis
• Negative skewed distribution(to the left)

  • Scores are concentrated on the right, long tail extending to the left
  • The mean is the lowest value
  • Mode highest value at the peak of curve
• Negative distributions

  Example

  
• Positive distributions

  Example

  
• Positive skew (to the right)

  • Long tail to the right of the graph
  • Distribution concentrated to the left
  • Mean as the lowest value to the right
  • Mode as the middle value
• MMM for positive

  mean is highest value

  median is middle

  mode is lowest
• MMM for negative

  mode is highest

  median middle

  mean is lowest