Variation
Expected Values - n
Student's - Equation from Biometrika Article on the Standard Deviation ( Site ) - I use it here to compare the three equations to each other. Both Students and RV Sigma are Standard Deviation Equations while the Normal is the Normal.
Normal
RV Sigma
In the Box M - You can type in values like c^2 c^4 c^6 ...... c^.5 c^.25