Make std() in stats be divided by N-1

[nwlandry]

See https://www.allendowney.com/blog/2024/06/08/which-standard-deviation/

[leotrs]

I guess both the population or the sample variance/stdev are valid. What is the default in numpy?

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[nwlandry]

This is the default behavior for Numpy and I added a note in the docstring saying that this is the behavior.