[math] Splitting out t- and chi-square tests

[Phil Steitz]

Currently, o.a.c.m.stat.inference has one interface, TestStatistic, that 
includes both t- and chi-square test statistics and tests. I think that it 
would be better to split these out into two interfaces -- TTest and 
ChiSquareTest (also splitting the impls accordingly).  Any objections to this?

Phil

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