public function testtTestTwoSample($μ₁, $μ₂, $n₁, $n₂, $σ₁, $σ₂, $Δ, array $ztest) { $this->assertEquals($ztest, Significance::tTestTwoSample($μ₁, $μ₂, $n₁, $n₂, $σ₁, $σ₂, $Δ), '', 0.001); }