The Mean Gross Annual Incomes of Certified Tack Welders Are

question 83

Multiple Choice

The mean gross annual incomes of certified tack welders are normally distributed with the mean of $50,000 and a standard deviation of $4,000. The ship building association wishes to find out whether their tack welders earn more or less than $50,000 annually. The alternate hypothesis is that the mean is not $50,000. When tested at the 99% level, these are the results found with megastat:

• A) Since the p-value is 0.43 at this level of testing, there is insufficient evidence to say that the welders earn an income different from $50,000.
• B) Since the p-value is 0.43 at this level of testing, there is sufficient evidence to say that the welders earn more than $50,000.
• C) The p-value of 0.043 indicates that there is sufficient evidence to say that the welders earn more than $50,000.

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Definitions:

Alternative Hypothesis

In hypothesis testing, the hypothesis that proposes a difference or relationship exists between two variables, as opposed to the null hypothesis.

Commute By Car

The act of traveling from home to work or another destination using a car.

Employee Commuting

The daily travel of employees between their places of residence and the workplace.

Random Sample

A subset of individuals chosen from a larger set, or population, where each individual has an equal probability of being selected.