stdevp( ) appears to be mislabeled

[parisse]

This is inferential statistics, which is advanced statistics. Before teaching that, I'm strongly convinced that one should teach descriptive statistics, including of course mean and standard deviation of a statistical serie (like for example the grades of students or the height...). And here it is of course divided by N and it is straightforward to explain why, while it is not for the unbiaised estimator from a sample (and in general inferential statistics is much more complicated to understand than descriptive statistics and I don't think you can understand inferential statistics if you don't have already well mastered descriptive statistics). That's why I'm convinced that the good name in a math package (especially in a calc) should be the shortest if one divides by N (i.e. stddev) and I won't change that.
Of course I agree that the documentation or even the menu items should make the distinction the clearest possible, I think it's clear in Xcas, but this does not depend on me on the Prime.