code: def conf_int(self):  # a method to be consistent with sm
      return [
          (-10.2936, 4.90523),
          (5.949595, 310.9044),
          (-26.65915, 12.16057),
          (-56.41929, 177.3168),
          (-392.9263, 164.7085),
      ]
  
file_path: statsmodels/statsmodels/regression/tests/results/results_regression.py
imports: import numpy
label_desc: Use image node_id 2 for calling the CCardWLS obj's underlying member method code with example usage: obj.conf_int() and returns: list