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In a large hospital, a nursing director selected a random sample of 38 registered nurses and found that the mean of their ages was 31.9



In a large hospital, a nursing director selected a random sample of 38 registered nurses and found that the mean of their ages was 31.9. The population standard deviation for the ages is 4.2. She selected a random sample of 28 nursing assistants and found the mean of their ages was 29.5. The population standard deviation of the ages for the assistants is 6.0. Find the 99% confidence interval of the differences in the ages. Use μ1 for the mean age of the nursing assistants. Round the answers to one decimal place.

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