Differentiate scale versus index.

Differentiate scale versus index.
 
  What will be an ideal response?

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Some of the most notorious atrocities ever committed in the name of research were conducted by the Nazi doctors.
 
  Indicate whether the statement is true or false

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Exploratory research focuses on who and how questions.
 
  Indicate whether the statement is true or false

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The greater the possibility of risk to the subject (participant), the greater the need to obtain informed consent.
 
  Indicate whether the statement is true or false

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Name the four levels of measurement, from lowest (discrete and least precise) to highest precision.
 
  What will be an ideal response?