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the mean annual incomes of certified welders are normally distributed with the mean of $50,550 and a population standard deviation of $2,000. the ship building association wishes to find out whether their welders earn $50,550 annually. a sample of 100 welders is taken and the mean annual income of the sample is $50,800. if the level of significance is 0.05, what conclusion should be drawn?
Sagot :
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