Mathematics, 12.08.2019 22:10, Clervoyantyvonne

The mean annual incomes of certified welders are normally distributed with the mean of $50,000 and a population standard deviation of $2,000. the ship building association wishes to find out whether their welders earn more or less than $50,000 annually. a sample of 100 welders is taken and the mean annual income of the sample is $50,350. if the level of significance is .05, what conclusion should be drawn

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The mean annual incomes of certified welders are normally distributed with the mean of $50,000 and a...