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A survey of certified consultants in US., done 15 years ago, found that their average salary was $74,914. An accounting researcher would like to test

A survey of certified consultants in US., done 15 years ago, found that their average salary was $74,914. An accounting researcher would like to test whether this average has changed over the years. A random sample of 112 certified consultants produced a mean salary of $78,695.

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