Hello I also am learning how to use mathematica to do something elementary statistics, so I would like to learn together, if your want, I would like to try to help you in your project.
Some commands that you can use are:
Mean,Median,Variance, StandardDeviation,Covariance,Quantile,Kurtosis,Skewness.
Looking at the documentation there may be the command that you need,there are many commands that can deal with and which are already programmed in mathematica