The mean annual income of certified welders is normally distributed with a 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 decision rule?
Do not reject the null hypothesis if computed z lies between -1.645 and +1.645; otherwise, reject it.
Do not reject the null hypothesis if computed z is greater than 1.645; otherwise, reject it.
Do not reject the null hyp

Question

The mean annual income of certified welders is normally distributed with a 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 decision rule?
	Do not reject the null hypothesis if computed z lies between -1.645 and +1.645; otherwise, reject it.
	Do not reject the null hypothesis if computed z is greater than 1.645; otherwise, reject it.
	Do not reject the null hyp

anonymous · Answer

hypothesis if computed z lies between -1.960 and +1.960; otherwise, reject it.
	Reject the null hypothesis if computed z is below -1.960; otherwise, reject it.