Could you please provide some guidance on the following:

1) Sample Skewness and Kurtosis Formulas

I have seen 2 differnt versions,can you please clarify which is correct:

Version#1: Sample Skewness

Sum of Third moment about the mean / cube of Std Deviation * 1/ N

Version#2:

[ [ Sum of Third moment about the mean] / (n-1) ] / cube of Std Deviation

Which one is correct?

2) In Gujarati 3.8, can you please provide additional details concerning the use/purpose of the Alternative Skew and Kurtosis calculation that is provided.

Thank you