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Selecting a method to accurately measure variables can be a complex task. Some data can be transformed from one level of measurement to another, and other data cannot. Measurement instruments must also be validated to prove they accurately measure the variables in question. In this Discussion, you will consider the measurement of data and compare measurement validity to the concept of design validity, introduced

What is an example of data that can be transformed from one level of measurement to another, and another example of data that cannot be transformed?
Why is validity for measurement so difficult to establish?
How are the concepts of validity for design and for measurement similar and different?
What is the relationship between reliability and validity?

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