public void ConstructorTest()
{
double[] observed = { 639, 241 };
double[] expected = { 660, 220 };
int degreesOfFreedom = 1;
var chi = new ChiSquareTest(expected, observed, degreesOfFreedom);
Assert.AreEqual(2.668, chi.Statistic, 0.015);
Assert.AreEqual(1, chi.DegreesOfFreedom);
Assert.AreEqual(0.1020, chi.PValue, 1e-4);
}