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standard deviation
The average distance of individual measurements from the mean.
IQR
The difference between the Third Quartile and the First Quartile
High Outlier
Greater than Q3 + 1.5(IQR)
Low Outlier
Less than Q1-1.5(IQR)
z-score
the number of standard deviations an observation is from the mean
For symmetric distributions
the mean and median are the same
For distributions that are skewed high
the mean is greater than the median
Adding a constant to all data values
Increases the measures of center but not measures of spread
Multiplying all data values
Changes the measures of center and the measures of spread.
Census
measurements or observations from the entire population are used
Sample
measurements or observations from part of the population are used