answer all these questions please with the right question number next to its letter 12-The mean...

answer all these questions please with the right question number next to its letter

12-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.

If the level of significance is 0.10, what is the decision rule?

Reject the null hypothesis Ho if computed z is greater than +1.65 or is less than -1.65.

Do not reject the null hypothesis if computed z is greater than 1.65; otherwise, reject it

Do not reject the null hypothesis if computed z lies between –1.96 and +1.96; otherwise, reject it

Reject the null hypothesis if computed z is below –1.96; otherwise, reject it

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orchestra answered 1 year ago

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