Adding a statistics sub-package

The full code I’ve written so far can be found here.

Now that I've learned the basics of linear algebra and implemented a few of the methods in my linalg package, I'm going back over my understanding of statistics and model building to see it from a linear algebra perspective. Therefore I'm going to add a sub-package called 'stats' to the 'linalg' package, in order to learn about how packages work in Python 3 and to help cement my understanding as I go. Everything I do here will be implemented using the existing methods in the 'linalg' package. Here is what I've done so far:

Fundamental building blocks

• Sum and mean
• Zero-center
• Variance, covariance, standard deviation and standard error
• Z-score

Statistical tests

• Pearson’s correlation
• One sample t-test
• Paired samples t-test
• Unpaired samples t-test
• Welch’s unpaired samples t-test

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