Find the error in the following incorrect calculation. 
Definitions:
Crime Area
A geographical area known for a higher incidence of criminal activity compared to surrounding regions.
Means
Statistical measures that represent the central point or average value of a dataset.
Marginal Means
The mean values of a variable across different levels of another variable, often used in the analysis of variance.
Main Effect
The direct influence of an independent variable on a dependent variable in an experimental study, ignoring the effects of other variables.
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