Mathematics, 12.08.2020 07:01 marineroadrian21
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. 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. 1.28
c. ±1.28
d. ±1.65
Answers: 3
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The mean gross annual incomes of certified welders are normally distributed with the mean of $20,000...
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