The mean gross annual incomes of certified welders are norma

The mean gross annual incomes of certified welders are normally distributed with the mean of $50,000 and a standard deviation of $14,000. It is claimed that welders for the ship building industry make much more than that. The ship building association wishesto find out whether their welders earn more than 70,000. What are the null and alternate hypotheses?

$\"H_0\\vdots\\:\\mu\\ge70,000\\:\\:H_1\\:\\mu<70,000\"$

The claim would always be the H1.

Thus,

H1: u > 70,000

The direct opposite of which is the Ho:

Ho: u <= 70,000

Thus, it is OPTION D. [ANSWER]

The mean gross annual incomes of certified welders are normally distributed with the mean of $50,000 and a standard deviation of $14,000. It is claimed that wel

The mean gross annual incomes of certified welders are norma

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