Mathematics, 09.12.2021 16:30 LarryJoeseph

The mean annual incomes of aircraft mechanics are normally distributed with the mean of $40,000 and a standard deviation of $2,000. A local union representative wishes to find out whether their members earn more or less than $40,000 annually. If the level of significance is 0.05 and σ is known, what is/are the critical value(s) for a 2-tail test?

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The mean annual incomes of aircraft mechanics are normally distributed with the mean of $40,000 and...