# Starting at Foundations: Stats

The foundation of data science; a reference or cheat sheet to relearn statistics.

__**Binary Classification Measures:**__

__**T-Tests:**__

- An Independent Samples t-test compares the means for two groups.
- A Paired sample t-test compares means from the same group at different times (say, one year apart).
- A One sample t-test tests the mean of a single group against a known mean.