Distributions

• whats a distribution

  graphs used to show how evenly data is spread
• whats a normal distribution

  symmetrical bell-shaped curve

  mean, mode & median are the same mid-point

  most people are in the middle, with a few in extreme areas
• whats a skewed distribution

  bell-shaped curve which isn't symmetrical, data clusters to one end
• whats a positive skewed distribution

  concentrated towards the left of the graph

  mode is highest point, median next & mean is furtherest along
• what an example of a positive distribution

  a hard test were most got low marks
• whats a negative skewed distribution

  concentrated towards the right of the graph

  mean is lowest, median is the middle & mode is the highest point
• whats an example of a negative distribution

  an easy test were most got high marks
• how do we know if theres a positive distribution

  mode is lower than the mean
• how do we know if theres a negative distribution

  mode is higher than the mean