code: def variance_at(self, singular_value):
          
          results = {}
          results.update(self.first_prediction(singular_value))
          results.update(self.second_prediction(singular_value))
          results.update(self.third_prediction(singular_value))
          return results
docs: get the error variance of all three terms at a singluar value
  
          Parameters
          ----------
          singular_value : int
              singular value to test
  
          Returns
          -------
          dict : dict
              dictionary of (err var term,prediction_name), standard_deviation pairs