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.
Readers Question: What is the difference between monetary and fiscal policy? 1  Monetary policy involves changing the interest rate and influencing the money supply.  Fiscal policy involves the government changing tax rates and levels of government spending to influence aggregate demand in the economy.