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Diffstat (limited to 'Lib/test/test_statistics.py')
| -rw-r--r-- | Lib/test/test_statistics.py | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Lib/test/test_statistics.py b/Lib/test/test_statistics.py index a9a427bc8d..0e46a7119f 100644 --- a/Lib/test/test_statistics.py +++ b/Lib/test/test_statistics.py @@ -2602,6 +2602,21 @@ class TestNormalDist: with self.assertRaises(self.module.StatisticsError): NormalDist(1, 0).overlap(X) # left operand sigma is zero + def test_zscore(self): + NormalDist = self.module.NormalDist + X = NormalDist(100, 15) + self.assertEqual(X.zscore(142), 2.8) + self.assertEqual(X.zscore(58), -2.8) + self.assertEqual(X.zscore(100), 0.0) + with self.assertRaises(TypeError): + X.zscore() # too few arguments + with self.assertRaises(TypeError): + X.zscore(1, 1) # too may arguments + with self.assertRaises(TypeError): + X.zscore(None) # non-numeric type + with self.assertRaises(self.module.StatisticsError): + NormalDist(1, 0).zscore(100) # sigma is zero + def test_properties(self): X = self.module.NormalDist(100, 15) self.assertEqual(X.mean, 100) |