code: def test_ci_var(self):
      assert_almost_equal(self.res1.ci_var(), self.res2.ci_var, 4)
  
imports: import numpy
  from numpy.testing import assert_almost_equal
  from statsmodels.datasets import star98
  from statsmodels.emplike.descriptive import DescStat
  from .results.el_results import DescStatRes
label_desc: Use image node_id 7 for calling the TestDescriptiveStatistics obj's underlying member method code with example usage: obj.test_ci_var() without return types