What can the permanent members of the UN Security Council do that nonpermanent members cannot?

What is (are) the reason(s) that conducting experimental research in naturalistic settings is difficult?

A) It is limited by demands and characteristics of the setting. B) Random assignment of participants to groups is very difficult. C) It is often difficult to obtain the number of participants required to create experimental and control groups. D) All of the above

How are quasi-experimental designs different from low-constraint methods?

A) Quasi-experiments have only one level of the independent variable. B) Low-constraint methods do not attempt to answer questions of causality. C) Low-constraint methods try to control confounding variables. D) Quasi-experiments take place in a laboratory.