Because an unreliable measure makes it difficult to find a true effect, researchers generally will try to make sure that their measures have an alpha of not less than

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An alpha of not less than .70 is generally considered acceptable in social science research for ensuring that measures are reliable enough to potentially find a true effect. Higher values indicate better reliability, but .70 is often cited as a minimum standard.

Because an Unreliable Measure Makes It Difficult to Find a True