The Mean Annual Incomes of Certified Welders Are Normally Distributed

question 35

Multiple Choice

The mean annual incomes of certified welders are normally distributed with the mean of $50,000 and a population standard deviation of $2,000. 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. If the level of significance is 0.10,what is the critical value?

• A)+1.645
• B)−1.282
• C)±1.282
• D)±1.645

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