Features/t test one #14
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T-test function + unit tests.
Not documented but the formula is similar to Excel
tTest(values1, values2, testTails, testType)
testTails not implemented yet. I'm unsure how to deal with this - just change 'probability' or should we accept an alpha?
testType: 1 = paired, 2 = unpaired, equal variances, 3 = unpaired, unequal variances
It passes the very limited unit tests I've made.