code: def observed_data_paths(self, data_directory):
      observed_data_paths = [
          os.path.join(data_directory, "cmdstan/eight_schools.data.R"),
          os.path.join(data_directory, "cmdstan/example_stan.data.R"),
          os.path.join(data_directory, "cmdstan/example_stan.json"),
      ]
  
      return observed_data_paths
  
imports: import os
  import numpy
  import pytest
  from ...None import from_cmdstan
  from ..helpers import check_multiple_attrs
label_desc: Use image node_id 3 for calling the TestDataCmdStan obj's underlying member method code with example usage: obj.observed_data_paths(data_directory) and returns: observed_data_paths