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Statistical Parametric Mapping. SPM (Statistical Parametric Mapping) refers to the construction and assessment of spatially extended statistical processes used to test hypotheses about functional imaging data. These ideas have been instantiated in software that is called SPM.
It gives us a start, but we still have to fill in certain blanks in order to derive the center, spread, and shape of the sampling distribution of the mean. In parametric statistics, we fill in the blanks concerning shape by assuming that the sampling distribution of the mean is normal.