The Mean Annual Incomes of Certified Welders Are Normally Distributed

question 5

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. A sample of 100 welders is taken and the mean annual income of the sample is $50,350. If the level of significance is 0.10,what conclusion should be drawn?

• A)Do not reject the null hypothesis as the test statistic is less than the critical value of z.
• B)Do not reject the null hypothesis as the test statistic is less than the critical value of t.
• C)Reject the null hypothesis as the test statistic is greater than the critical value of t.
• D)Reject the null hypothesis as the test statistic is greater than the critical value of z.

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