_________________ collect premiums on insurance policies and employee/employer contributions from pension fund participants and provide retirement benefits and insurance against major financial losses.

Which of the following statements is true regarding a field experiment?

A) It takes place in an artificial environment. B) It has low external validity. C) It has low internal validity. D) The experimenter can control the environment easily.

All of the following are tasks of data cleansing EXCEPT:

A) decoding data to make them understandable for data warehousing applications. B) adding time stamps to distinguish values for the same attribute over time. C) generating primary keys for each row of a table. D) creating foreign keys.