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8 
Outliers and Groupings Identify and discuss outliers. Identify and discuss any groupings seen 
Measures of Central Tendency


What do I look for in scatter plots? Anything unusual 

Do you see any outliers?
unusually far from the trend 
Do you see any groupings?

What do I see in these scatter plots?  
An Outlier is a data point significantly far from the trend or group of other data. Is the outlier an error? So remove it Is the outlier an actual data value? Then produce TWO regression models Is it appropriate to remove outlier? Do NOT remove outlier just to make model (line) fit better! Discuss what the outlier could be and if it is appropriate to remove or not.
