Outlier fences:
Q1 - 1.5IQR
Q3 + 1.5IQR
sd is always positive
(or zero if all the data is identical)
Categorical graphs:
bar and pie
Quantitative graphs:
stem and leaf (shows data)
boxplot (can hide shape)
ogive/cumulative freq
dotplot
histogram
Independent data makes bar graphs with similar levels
The mean is lower than the median for skewed left data
Measures of spread: IQR, sd and range
Measures of center: mean and median
Which of the above are resistant? med and IQR
Rule of thumb: 68-95-99.7
z-score formula: (x - mu)/sigma
