in measurement, – refers to a measure’s ability to accurately represent the variable the researcher is investigating. but this concept is made up of many different components. – is the extent to which a given measure appears to be measuring the variable in question. – evaluates how well a measure taps into all aspects of a particular variable. – represents how well a measure relates to actual behavior.

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

there are indirect ways of affecting state laws   by with holding funding's. and that's why we have a 55mph speed on the high way with a design of 70mph speed.

money is the anwser i think