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Employees in a large accounting firm claim that the mean salary of the firm’s accountants is...

Employees in a large accounting firm claim that the mean salary of the firm’s accountants is less than that of its competitor’s which is $45,000. A random sample of 16 of the firm’s accountants has a mean salary of $43,500. Assume that the population standard deviation is $5200. Test the employees claim. What assumption is necessary for this test to be valid?

None. The Central Limit Theorem makes any assumptions unnecessary.

The population of all salaries of the firm’s accountants is normally distributed because of the small sample size.

The population variance must equal the population mean.
Math   Statistics-And-Probability   
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