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Suppose we want to estimate the average salary in the company A. We have a random sample of 3000 employees. We know that the sample

Suppose we want to estimate the average salary in the company A. We have a random sample of 3000 employees. We know that the sample mean salary is 6 000 PLN with sample standard deviation 1 000 PLN and Margin of Error is 250 PLN for confidence level 0,9. The 90% confidence interval for the average salary in the entire population is (unit: PLN) :

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