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The mean gross annual incomes of the population of certified tack welders are normally distributed with the mean

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.

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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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