Imagine you own a moving company. A major component in moving is managing the weight of different cargo. If you had a scale that gave you the same weight three times, we would say that was a very scale. But, if it turns out the weights given are in kilograms instead of pounds, it would not be a measure if you charge for delivery by the pound.

a$.$ Reliable $/$ valid

b$.$ Correlation $/$ causation

c$.$ Datum $/$ data

d$.$ dependable $/$ accurate

e$.$ staunch $/$ factual