code: def test_series_stat_fail(self):
      with self.assertRaisesRegex(
          TypeError, "Could not convert object"
      ):
          ps.Series(["a", "b", "c"]).mean()
      with self.assertRaisesRegex(
          TypeError, "Could not convert object"
      ):
          ps.Series(["a", "b", "c"]).skew()
      with self.assertRaisesRegex(
          TypeError, "Could not convert object"
      ):
          ps.Series(["a", "b", "c"]).kurtosis()
      with self.assertRaisesRegex(
          TypeError, "Could not convert object"
      ):
          ps.Series(["a", "b", "c"]).std()
      with self.assertRaisesRegex(
          TypeError, "Could not convert object"
      ):
          ps.Series(["a", "b", "c"]).var()
      with self.assertRaisesRegex(
          TypeError, "Could not convert object"
      ):
          ps.Series(["a", "b", "c"]).median()
      with self.assertRaisesRegex(
          TypeError, "Could not convert object"
      ):
          ps.Series(["a", "b", "c"]).sem()
  
imports: import unittest
  from decimal import Decimal
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.testing.pandasutils import ComparisonTestBase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 24 for calling the SeriesStatMixin obj's underlying member method code with example usage: obj.test_series_stat_fail() without return types