The mean annual incomes of certified welders are normally distributed with a mean of $51,050 and a population standard deviation of $2,000. The ship building association wishes to find out whether their welders earn more or less than $51,050 annually. A sample of 100 welders is taken and the mean annual income of the sample is $51,350. If the level of significance is 0.05, what conclusion should be drawn?
The
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Do not reject the null hypothesis as the test statistic is less than the critical value of z.
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Do not reject the null hypothesis as the test statistic is less than the critical value of t.
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Reject the null hypothesis as the test statistic is greater than the critical value of t.
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