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8) In a study on the ages of registered nurses and nursing assistants, the following table was obtained. Registered Assistant x1 = 30.2 yrs x2

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8) In a study on the ages of registered nurses and nursing assistants, the following table was obtained. Registered Assistant x1 = 30.2 yrs x2 = 31.7 yrs 2 = 31.36 = 18.49 7 = 30 n2 = 40 Construct a 99% confidence interval for /1 - /2, the difference between the mean age of registered nurses and the mean age of nursing assistants. A) -3.9 yrs

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