Business, 21.04.2020 19:13, kibyrd14

The mean annual income of certified welders is normally distributed with a mean of $50,000 and a population standard deviation of $2,000. A ship building association takes a sample of 30 certified welders and calculate a sample mean income of $48,900. The ship building association wishes to find out whether their welders earn more or less than $50,000 annually. The alternate hypothesis is that the mean is not $50,000. The level of significance is .10. What is the value of the test statistic?

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The mean annual income of certified welders is normally distributed with a mean of $50,000 and a pop...