Anna was a five-year-old girl when she was discovered. She lived for years isolated in an attic and kept barely alive. Anna only learned a few basic life skills before she died at age 10. Anna is considered to be a by sociologists.

answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;

answer; john stuart mill's principle of utility is your answer; /// good luck

answer; opportunity cost;