Which of the following is true about indexes and scales?
a. they are nominal measures of variables.
b. they rank-order the units of analysis in terms of specific variables.
c. their attributes form an intensity structure.
d. they are ordinal measures of variables they are interval measures.

The following statement is true about indexes and scales: They rank-order the units of analysis in terms of specific variables.

Indexes provides with a way to make a complex measure that iterate consequence for multiple rank-ordered related questions or statements.  

Scale is a type of complex measurement that is combined of several items that have a empirical structure among them.

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step-by-step explanation:

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