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The Mean Gross Annual Incomes of Certified Tack Welders Are

question 158

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The mean gross annual incomes of certified tack welders are normally distributed with the mean of $50,000 and a standard deviation of $4,000. The ship building association wishes to find out whether their tack welders earn more or less than $50,000 annually. The alternate hypothesis is that the mean is not $50,000.
Which of the following is the alternate hypothesis?


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