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Mathematics, 18.12.2019 05:31 Tetto
The mean gross annual incomes of certified welders are normally distributed with the mean of $20,000 and a standard deviation of $2,000. the ship building association wishes to find out whether their welders earn more or less than $20,000 annually. the alternate hypothesis is that the mean is not $20,000. if the level of significance is 0.10, what is the critical value?
1.65
1.28
±1.28
±1.65
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