distributions

• what is a skewed distribution

  A skewed distribution is one where frequency data is not spread evenly 
• characteristics of negative skew

  • Data that is negatively skewed have a long tail that extends to the left.
  •  the median will be greater than the mean 
• characteristics of positive skew

  • Data that is positively skewed has a long tail that extends to the right.
  •  the mean will be greater than the median
• Positive skew = most people did slightly below 'average', but a few people did really really well and were WAY above average.

  Negative skew = most people did slightly above 'average', but a few people really bombed and were WAY below average.