DATA PRESENTING

Normal distrubtion: mean=median=mode

negative skew: mean<median

positive skew: mean>median

• Cumulative frequency graph: plot the points at the upper bound of each group 
                                            mean: 1/2(n) LQ: 1/4(n) UQ: 3/4(n)
• stem and leaf: remeber a key 
• pie charts: data is in proportion to area of the circle r¹=r²
                                                                           n¹=n²
• bar charts: used for catagorical data 
• vertical line charts: gaps between lines, used for numerical discrete data
  
• histograms: bars touvhing, used for numerical contiuous data, frequency=area 
  
• box plots

outlier: x<LQ- (1.5 x IQR) or x>UQ+(1.5 x IQR)