At 1:20 tiumestamp, it is mentioned that if the difference between a maximum and minimum amount in a data set is too large, the data set may be problematic. How do you prove if this is true or not?

You need to look at the distribution of the data. If the minimum or the maximum (or both) is an outlier (i.e., data point that differs significantly from other observations), than the value of the range could indeed be problematic.

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