An intervening variable facilitates a better understanding of the relationship between the independent and dependent variables when the variables appear to not have a definite connection. They are studied by means of operational definitions and have no existence apart.
Difference between Microevolution and Macroevolution. â¢ Micro evolution refers to visible changes in a population of the same species over a period of time. â¢ Macroevolution is what evolution is as described by the theory of evolution by Darwin.
One of the main differences between traditional indemnity insurance and managed care plans is the way the insured receives services, particularly from medical specialists. Managed health care plans often require the patient to obtain a referral from a designated primary physician.