First provide a definition of an index or scale. Your book discussed ways in which indexes can be used in the development of research questions and their measurements. Identify at least two reasons why a multi-item index would be useful to improve validity and two reasons why it would useful to improve reliability.

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The Answer of First provide a definition of an index or scale. Your book discussed ways in which indexes can be used in the development of research questions and their measurements. Identify at least two reasons why a multi-item index would be useful to improve validity and two reasons why it would useful to improve reliability.

First Provide a Definition of an Index or Scale