Fixes t-test and improves the decimalize function.
Fixes t-test and improves the decimalize function.

This commit fixes the one-sample t-test function.
I modified the code to integrate the decimalize code
to avoid floating point arithmetic.

I also improved the decimalize function to handle
both single numbers and lists/vectors.

sheriferson/simple-statistics-py,jhowardanderson/simplestatistics,sheriferson/simplestatistics,tmcw/simple-statistics-py