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 $20,000.If the level of significance is 0.10,what is the critical value?
A)1.65
B)2.58
C)1.28
D)$\pm$1.28
E)$\pm$1.65

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The Answer of 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 $20,000.If the level of significance is 0.10,what is the critical value?
A)1.65
B)2.58
C)1.28
D)$\pm$1.28
E)$\pm$1.65

The Mean Gross Annual Incomes of Certified Welders Are Normally ±\pm±

The Mean Gross Annual Incomes of Certified Welders Are Normally $\pm$