code: def df_normal_dist():
      np.random.seed(0)
      mu, sigma = 0, 0.1  # mean and standard deviation
      s = np.random.normal(mu, sigma, 100)
      df = pd.DataFrame(s)
      df.columns = ["var"]
  
      return df
  
file_path: feature_engine/tests/conftest.py
imports: import numpy
  import pandas
  import pytest
label_desc: Use image node_id 12 for calling a global function with example usage: df_normal_dist() and returns: df