Distributions

• Normal distribution features:

  • Curve is always symmetrical
  • Curve extends outwards but never touches 0
  • Mean, median and mode all occupy around the same mid-point on a curve

  
• Skewed distributions favour one side - Spread of data that is not symmetrical, it clusters at one end
• Positive skewed distribution - most of the data is concentrated on the left of the graph, the long tail is on the right side of the peak of the data

  
• Negative skewed distribution - most of the data is concentrated on the right of the graph, the long tail is on the left side of the peak of data

  
• Plot the mode first, then the median, then the mean