If no-one offers you a satisfactory answer to this question you might try asking it again specifying a context. This term may be used in manufacturing, it may be used in experimentation. It might be used in other contexts too.
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They are variables that can take quantitative - as opposed to qualitative values. For example, the colour of peoples' eyes is a qualitative variable, but their age or shoe size are quantitative variables.
correlation * * * * * Only if the relationship is linear. For example, the correlataion between y and x when y = x2 is zero. But a very strong relationship between the two variables.
Ability to analyze operational performance and develop priorities for improvements.
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.