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)
Comments
No comments have yet been made