An individual difference variable are variables that occur naturally and that a researcher cannot assign a participant to. These include gender, age, height, etc. A manipulated variable a researcher can assign a person to such as a placebo group vs the actual medicine.
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controlled,manipulated,responding variables
The endogenous variables value is established by the conditions of the other variables in the structure. The exogenous variables value in independent of the conditions of the other variables in the structure. The difference between the endogenous and exogenous variables is the endogenous depends solely on the structure and the exogenous depend on outside elements.
a descriptive investigation is a scientific ivestigation that collects data which measure or decribe objects or events. it collects qualitative & quantitative data. it includes a question, but no hypothesis ; no variables are manipulated .
Mathematical model is exact in nature.it has Beta zero and Beta one and no stochastic or disturbance variables. Econometric model represents omitted variable, error in measurement and stochastic variables.
A parameter is a limit: could be a speed limit on the road. A variable is something that changes in the system: could be the actual speed of a car.