Question
The mean gross annual incomes of the population of certified tack welders are normally distributed with the mean of $20,000 and a standard deviation of
The mean gross annual incomes of the population of certified tack welders are normally distributed with the mean of $20,000 and a standard deviation of $5,000.The ship building association wishes to find out whether their tack welders earn $20,000 annually or not.A sample of 81 ship building tack welders revealed a sample mean of $21,111.What is the result of the test?
z = 2, Reject the null hypothesis, the ship building tack welders do not earn $21,111.
z = 2, Accept the null hypothesis, the ship building tack welders do earn $20,000.
z = 2, Reject the null hypothesis, the ship building tack welders do not earn $20,000. They earn less.
z = 2, Reject the null hypothesis, the ship building tack welders do earn $20,000. They earn more.
z = 2, Reject the null hypothesis, the ship building tack welders do not earn $20,000. They earn more.
z = 2, Fail to reject the null hypothesis, the ship building tack welders do not earn $20,000. They earn more.
The paired t-test is used for what type of samples?
30 or more
large
multiple groups
independent
dependent
nominal data
To compare a sample to a sample when n < 30, which distribution should be used?
decision rule
the z distribution
the t distribution
the F distribution
the chi-square distribution
the alpha distribution
p-value distribution
To compare a sample to a sample when n 30, which distribution should be used?
decision rule
the z distribution
the t distribution
the F distribution
the chi-square distribution
the alpha distribution
p-value distribution
What is another name for the alternate hypothesis?
null hypothesis
alternate hypothesis
research hypothesis
decision rule
critical hypothesis
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