Students T-Test

Added functions for Students T-Test one sample and independant sets and a function to convert a t-value to a p-value. Not sure about the naming, if you would like me to change the function names and resubmit requrest, let me know. I have tests, I will add examples next week and I would like to add dependant sets after that.
I've been considering the same thing. I agree about the nameing (being terrible) and I'd like to find a solution.

I don't think add equalStdev is good because Welch's formula works just fine when they're equal. I'd be more open to just calling it StudentT under the expectation that someone looking for Welch would see that under-the-hood it really is Welch, but I'm not sure that's a great solution either.