distributions

• normal distributions

  • produces a symmetrical bell-shaped curve when plotted indicating scores new close to the mean which progressively fewer scores located at the extremes of either tail of the distribution
  • tobe considered normal, 68.26% will lie within one standard deviation of the mean (34.13% either side) and 94.55% of the scores will lie within 2 standard deviations from the mean
• skewed distributions

  • POSITIVELY - large proportion of scores falling below the mean
  • NEGATIVELY - large proportion of scores falling above the mean
  • mode remains the highest point in the graph for pos and neg skews as it isn't affected by extreme scores